Maybe he is Nemesis...? We'll never know now. lol
I was hoping he would be the main character in RE5, since he has lots of ties to Africa and he's the first person to actually put forth the theory that Marcus "kept changing the mother virus." Also, he kicks ass!
You know...RE0 actually helped set up the setting for RE5. It pretty much gave it away that the Progenitor Virus was from Africa. D:
Well, I'm sure Billy wouldn't show himself to the world, since he's supposed to be "dead". So... If he does make a future appearance in any games, it's going to be hard to think how he will. Lol a Bird-Man?