Tyson was not even the best fighter of his generation. His record is littered with guys off of bum row. And yes he was the Champ in his
prime when Buster knocked the dogshit out of him. Lewis was better, Holyfield was better and a journeyman named Buster exposed the myth of Tyson.
Greatest of all time-that is laughable- so he could of beat Joe Lewis, Ali, Marciano, or how about Foreman in his prime? Not a chance.
Lee was not just an actor but the founder of Jeet Kune Do. He was also the Godfather of MMA according to Dana White and many others.
Obviously you are in love with Tyson's highlight reel of uppercuts to flabby and over the hill "fighters" and don't put much stock in martial arts. Tommy Morrison had a much better record and used to destroy the same kind of guys Tyson did. So by your measurement -Tommy the Duke would win against the "actor" and basically any heavyweight boxer-because of size advantage. You are right a smaller guy has Never beat a bigger guy-ever.
Over the years I have seen many smaller little guys that looked like nothing special- beat the shit out of guys twice their size. And these are just your run of the mill bar fights-not the greatest martial artist of all time.
In a controlled boxing match-I would give Tyson an edge -but a cage fight, anything goes, to the death- Lee would rip his eyes out in the first 1/2 second of the fight.