it all makes sense now.....

that's why the prototype needs poppy. if ch 5 is the last chapter, we may have to fight a mutant prototype that forced poppy to combine with it and previous dead toys and bigger bodies a la sid from toy story with his toys.

looking between what we have of the prototype, catnap's shrine, and the spider baby from toy story, the similarities are undeniable. but we won't know for sure until we get closer to teaser and trailer territory for ch5.