To add to Sgt. Cycloptic in the same bunker one of those notes it is mentioned that he, rook, wants to hide his face and is looking for a mask.

That bookshelf also included Mumu's Fashion Week, a series of inventory upgrade quest from FC4.
Also that "Bigfoot" skeleton isn't the only one, and it isn't actually Bigfoot.

from the judge thing i belive he is rook, we find dutch's bunker in the new edens secret and find him gone, we have 2 notes 1 saying that i wasnt to be free from sin and the other saying i want to not be judged i want to be the d=judge and judge the others. dutch was killed so it cant be him, the father and the rook were the only ones there for the 17 years. chances are the judge is the rook

in the basement with the mars easter egg if u go and see the cow picture on that wall thats actually from goat simulator