Because the UnityDependencyResolver.GetInstances() method is using the ResolveAll() method of Unity it will not return any unnamed instances that were registered in the Unity container. I'm not sure if this is intentional since this is the default behavior for Unity, however it did cause me some confusion when I ran into it.

If this is not intentional I have a fix I implemented and can do a pull request to resolve it.

Thanks,
Kent