I should correct myself... The textures I have came in that one hack with all the different Cloud swords...
Yeah, they don't work in Classic mode or Boss Battles or All Star or Sub Space... Not a big issue though.
If you want the textures/vertexes/models to work in those places, you are going to have to keep the .pac texture/vertex/model file for it to show in Single Player modes.
The PSA will only be compatible with the models that will be included since there's specific model adjustments that would cause funky shiz without the models. Why you'd want to use this PSA without the model I don't know, but anyways as MarioDK said the tail will be animated anyway
I would love to see a levitating Wolf who shoots energy balls.