What I think happened at the end was that the ending...was actually the beginning! Like it's showing us what happened before Henry entered the studio and after he received the letter from Joey, they would both have a little talk before the actual BATIM story would start, this would also be proving that Joey was never at the studio throughout the entire game!
I've also been wondering if Henry owed Joey a favor, Joey did mention that he was always pushing him to do the right thing at the time, making me believe he and Henry could've been partners(and still). So Joey must've done something so indulging and honoring for him, that Henry had to gi