T.A., I can't explain why the leading characters in Hamilton are payed by a black guy or a Muslim ..... but the opening lyrics in the opening song sort of asks a similar question.
"How does a bastard, orphan, son of a whore and a Scotsman, dropped in the middle of a forgotten spot in the Caribbean by providence, impoverished and in squalor grow up to be a hero and a scholar?"
That opening question is apparently answered on that stage over the next couple of hours ... and may also answer the question you have asked.
Although I am not the least bit pregitious (can't even spell it correctly) , I'd like to hear the reason why also!
But only if and when answered by the Hamilton producers!
There must be some valid reason for doing so.