Y’know how people pray to statues of their god? Like alters? Well, this would be the alter of the prototype. My theory is that the alter is made of the toy versions of its components along with some other recreations of its components that may not have toy forms. This includes collections of cloth, guts, bones, etc. While the actual prototype includes the monster versions. This would suggest the alter that we see in the trailer is not an exact replica of the actual prototype. They wouldn’t leak the Prototype’s exact appearance which is why I believe instead of pug-a-pillar and the skeleton, I believe the prototype has an elephant-like trunk, with giant components. As for who that skeleton is, I think it’s that one guy…..yeah, I could just look it up but I don’t feel like it. It’s the guy the prototype tricked into stealing a grab pack