>>55299421If he was a 3D model artist, he'd recognize how they were made right away:
When you retopologize a sculpted model to reduce the polycount, you often don't modify the original model at all. Instead, you make a new model on top of the old one using the snap function by clicking where you want the new vertices to be (pic related is someone in the process of building a new model over a face).
That's the main use for it, but there's another application for it: Turning multiple models into one solid model.
So, let's say for example you want to make a fish monster that combines elements of a shark, piranha, and angler fish. If you have models of those things that are similar-ish to the general shape you want, you can chop them up and delete/hide parts you don't need then arrange what's leftover into an abomination that's the right general shape (free to skew the proportions a bit if you need to). Then you retopologize them and you're left with a single, solid model with the correct shape. And you're free to add any new pieces or extrusions as you go.
For example, I'd be amazed if he didn't he a T-posing
>>55302758 Cinderace model in the program that he was using to build the green thing around.