diff --git a/zig-ecs/src/ecs/component_storage.zig b/zig-ecs/src/ecs/component_storage.zig
index f5e1815..9d53f38 100644
--- a/zig-ecs/src/ecs/component_storage.zig
+++ b/zig-ecs/src/ecs/component_storage.zig
@@ -27,6 +27,7 @@ pub fn ComponentStorage(comptime CompT: type, comptime EntityT: type) type {
         set: *SparseSet(EntityT),
         instances: std.ArrayList(CompOrAlmostEmptyT),
         allocator: ?*std.mem.Allocator,
+        super: usize = 0, /// doesnt really belong here...used to denote group ownership
         safe_deinit: fn (*Self) void,
         safe_swap: fn (*Self, EntityT, EntityT) void,
         construction: Signal(EntityT),
@@ -68,6 +69,7 @@ pub fn ComponentStorage(comptime CompT: type, comptime EntityT: type) type {
             if (!is_empty_struct)
                 store.instances = std.ArrayList(CompOrAlmostEmptyT).init(allocator);
             store.allocator = allocator;
+            store.super = 0;
             store.construction = Signal(EntityT).init(allocator);
             store.update = Signal(EntityT).init(allocator);
             store.destruction = Signal(EntityT).init(allocator);
diff --git a/zig-ecs/src/ecs/groups.zig b/zig-ecs/src/ecs/groups.zig
index 9e8dcda..3cb682b 100644
--- a/zig-ecs/src/ecs/groups.zig
+++ b/zig-ecs/src/ecs/groups.zig
@@ -78,13 +78,15 @@ pub fn OwningGroup(comptime n_owned: usize, comptime n_includes: usize, comptime
         const Self = @This();
 
         current: *usize,
+        super: *usize,
         registry: *Registry,
         owned_type_ids: [n_owned]u32,
         include_type_ids: [n_includes]u32,
         exclude_type_ids: [n_excludes]u32,
 
-        pub fn init(current: *usize, registry: *Registry, owned_type_ids: [n_owned]u32, include_type_ids: [n_includes]u32, exclude_type_ids: [n_excludes]u32) Self {
+        pub fn init(super: *usize, current: *usize, registry: *Registry, owned_type_ids: [n_owned]u32, include_type_ids: [n_includes]u32, exclude_type_ids: [n_excludes]u32) Self {
             return Self{
+                .super = super,
                 .current = current,
                 .registry = registry,
                 .owned_type_ids = owned_type_ids,
@@ -96,6 +98,10 @@ pub fn OwningGroup(comptime n_owned: usize, comptime n_includes: usize, comptime
         pub fn len(self: Self) usize {
             return self.current.*;
         }
+
+        pub fn sortable(self: *Registry, comptime T: type) bool {
+            return self.super.* == n_owned + n_includes + n_excludes;
+        }
     };
 }
 
@@ -183,4 +189,33 @@ test "OwningGroup add/remove" {
 
     reg.remove(i32, e0);
     std.testing.expectEqual(group.len(), 0);
+}
+
+test "multiple OwningGroups" {
+    const Sprite = struct { x: f32 };
+    const Transform = struct { x: f32 };
+    const Renderable = struct { x: f32 };
+    const Rotation = struct { x: f32 };
+
+    var reg = Registry.init(std.testing.allocator);
+    defer reg.deinit();
+
+    // var group1 = reg.group(.{u64, u32}, .{}, .{});
+    // var group2 = reg.group(.{u64, u32, u8}, .{}, .{});
+
+    var group5 = reg.group(.{Sprite, Transform}, .{Renderable, Rotation}, .{});
+    var group3 = reg.group(.{Sprite}, .{Renderable}, .{});
+    var group4 = reg.group(.{Sprite, Transform}, .{Renderable}, .{});
+
+    var last_size: u8 = 0;
+    for (reg.groups.items) |grp| {
+        std.testing.expect(last_size <= grp.size);
+        last_size = grp.size;
+        std.debug.warn("grp: {}\n", .{grp.size});
+    }
+
+    std.testing.expect(!reg.sortable(Sprite));
+
+    // this will break the group
+    // var group6 = reg.group(.{Sprite, Rotation}, .{}, .{});
 }
\ No newline at end of file
diff --git a/zig-ecs/src/ecs/type_store.zig b/zig-ecs/src/ecs/type_store.zig
index 9a52341..56855ec 100644
--- a/zig-ecs/src/ecs/type_store.zig
+++ b/zig-ecs/src/ecs/type_store.zig
@@ -22,12 +22,10 @@ pub const TypeStore = struct {
     }
 
     /// adds instance, returning a pointer to the item as it lives in the store
-    pub fn add(self: *TypeStore, instance: var) *@TypeOf(instance) {
+    pub fn add(self: *TypeStore, instance: var) void {
         var bytes = self.allocator.alloc(u8, @sizeOf(@TypeOf(instance))) catch unreachable;
-        var ptr = @ptrCast(*@TypeOf(instance), @alignCast(@alignOf(@TypeOf(instance)), bytes));
-        ptr.* = instance;
+        std.mem.copy(u8, bytes, std.mem.asBytes(&instance));
         _ = self.map.put(utils.typeId(@TypeOf(instance)), bytes) catch unreachable;
-        return ptr;
     }
 
     pub fn get(self: *TypeStore, comptime T: type) *T {
@@ -42,9 +40,11 @@ pub const TypeStore = struct {
     }
 
     pub fn getOrAdd(self: *TypeStore, comptime T: type) *T {
-        if (self.has(T)) return self.get(T);
-        var instance = std.mem.zeroes(T);
-        return self.add(instance);
+        if (!self.has(T)) {
+            var instance = std.mem.zeroes(T);
+            self.add(instance);
+        }
+        return self.get(T);
     }
 
     pub fn remove(self: *TypeStore, comptime T: type) void {
@@ -60,22 +60,22 @@ pub const TypeStore = struct {
 };
 
 test "TypeStore" {
-    const Vector = struct { x: f32 = 0, y: f32 = 0, z: f32 = 0};
+    const Vector = struct { x: f32 = 0, y: f32 = 0, z: f32 = 0 };
 
     var store = TypeStore.init(std.testing.allocator);
     defer store.deinit();
 
-    var orig = Vector{.x = 5, .y = 6, .z = 8};
-    var inserted = store.add(orig);
+    var orig = Vector{ .x = 5, .y = 6, .z = 8 };
+    store.add(orig);
     std.testing.expect(store.has(Vector));
-    std.testing.expectEqual(inserted.*, Vector{.x = 5, .y = 6, .z = 8});
+    std.testing.expectEqual(store.get(Vector).*, orig);
 
     var v = store.get(Vector);
-    std.testing.expectEqual(v.*, Vector{.x = 5, .y = 6, .z = 8});
+    std.testing.expectEqual(v.*, Vector{ .x = 5, .y = 6, .z = 8 });
     v.*.x = 666;
 
     var v2 = store.get(Vector);
-    std.testing.expectEqual(v2.*, Vector{.x = 666, .y = 6, .z = 8});
+    std.testing.expectEqual(v2.*, Vector{ .x = 666, .y = 6, .z = 8 });
 
     store.remove(Vector);
     std.testing.expect(!store.has(Vector));
@@ -86,4 +86,4 @@ test "TypeStore" {
 
     var v4 = store.get(u32);
     std.testing.expectEqual(v3.*, 777);
-}
\ No newline at end of file
+}
diff --git a/zig-ecs/src/ecs/utils.zig b/zig-ecs/src/ecs/utils.zig
index 87cc054..0f7cb33 100644
--- a/zig-ecs/src/ecs/utils.zig
+++ b/zig-ecs/src/ecs/utils.zig
@@ -41,12 +41,12 @@ pub fn sortSub(comptime T1: type, comptime T2: type, items: []T1, sub_items: []T
 
 /// comptime string hashing for the type names
 pub fn typeId(comptime T: type) u32 {
-    return hashStringFnv(u32, @typeName(T));
+    comptime return hashStringFnv(u32, @typeName(T));
 }
 
 /// comptime string hashing for the type names
 pub fn typeId64(comptime T: type) u64 {
-    return hashStringFnv(u64, @typeName(T));
+    comptime return hashStringFnv(u64, @typeName(T));
 }
 
 /// u32 Fowler-Noll-Vo string hash
diff --git a/zig-ecs/tests/registry_test.zig b/zig-ecs/tests/registry_test.zig
index bec5c88..a730451 100644
--- a/zig-ecs/tests/registry_test.zig
+++ b/zig-ecs/tests/registry_test.zig
@@ -77,9 +77,9 @@ test "singletons" {
     defer reg.deinit();
 
     var pos = Position{ .x = 5, .y = 5 };
-    var inserted = reg.singletons.add(pos);
+    reg.singletons.add(pos);
     std.testing.expect(reg.singletons.has(Position));
-    std.testing.expectEqual(inserted.*, pos);
+    std.testing.expectEqual(reg.singletons.get(Position).*, pos);
 
     reg.singletons.remove(Position);
     std.testing.expect(!reg.singletons.has(Position));