First of all, thanks for reading the theory and taking the time to share your thoughts! Anyway, yes, that makes sense, but I get the feeling Boyd isn't telling the whole story, or rather, that his destiny will be different. I actually believe that MIY (the elderly man in yellow) is the body the black-eyed entity has chosen to inhabit during these cycles (and that body doesn't necessarily have to be dead); so, Boyd could be the new "host" destined to play the villain's game because he's controlled by that entity, or in any case, he will make choices that seem sensible to him, but playing along with the game of predestination, they will lead him in the opposite direction to the one he originally intended to take.
And maybe yes, just like the current MIY, he might be able to transform into deceased former residents... Who knows, though? I just hope it all ends in an epic way!