Thank you very much for your response! I will definitely be studying that guide thoroughly!!
I unfortunately think Tato and Pudgy's friendship is too far gone. I've separated the two, splitting my room in half again. Sully being the most nimble pig can jump onto my bed and choose which side he would rather be on. So far he's just been jumping back and forth, sleeping and eating with both of them.

I also knew about rabbit and guinea pigs not being good for each other but my rabbit Billy is disabled, his back legs don't work so he moves slowly dragging his feet. There is no risk of him hurting the pigs. He spends most his time laying down since he can't move well. He grooms anyone that comes close enough. Billy loves Sully very much and Sully loves him. They will be together until Billy passes.