Henry and Joey designs are @doodledrawsthings
So after listening to DAGames song Build our Machine, and after my own reading up on Ub Iwerks and Walt Disney, (also here Bendy was around before Henry left) my headcanon is that Bendy got along really well with Henry, even if he could be a little butt at times and be the devious little bugger Joey designed him to be. Eventually Henry gets drafted (whoever came up with that headcanon, i love eet), and around that time Joey starts acting strangely, talking about Bendy and other matters. Per Ub leaving Disney because of a contract and of course disagreements, Henry leaves Joey’s studio not only because he got drafted, but because he had grown weary of Joey’s nonsense.
So Bendy is left unprotected and helpless to his creator’s devices, and things start going downhill from there. It sounded like DAGames’ song was speaking about more than one person, so I thought, what if Bendy was not only ticked at Joey or any other person at the studios, but felt abandoned by Henry when he left the studios? It would explain why he wants revenge on him as well.
So yeah, my BATIM headcanon à la Ub Iwerks and Walt Disney.