If you really want sprites, and i send you the ones i got from Neidmad you must give credits and also cut them out cbf giving all mine :D
Sprite animations are easy to make all you do is put pics one after the other in the order you feel like.
Hardest part about sprite animations is trying to put each pic following the other and not moving up and down etc.... In that way no sprites are better.
Sprites pretty much destroy the whole point of Pivot. Pivot is supposed to be a simple animating program that could be used to make figures easily and animate in a easy and quick way. Unless you made the sprites yourself, which you didn't. It's like copy and pasting.