There are accounts that Tyson ducked a 41 year old Foreman from sources close to both parties, he had a real fear of Foreman apparently.
Yes we all know he had the dip and duck movement to get in close but when you come up against the greats they know how to handle it. Tyson fanatics act like Cus's peakaboo style hadn't been seen before Tyson came on the scene... it wasn't radically new and Cus himself already trained fighters such as Floyd Patterson, José Torres, Vinnie Ferguson. Ontop of that he'd tutored Teddy Atlas, Kevin Rooney, and Joe Fariello in his boxing training methods. Rooney took over and continued training him till the end of 1988... I think when you consider he was trained from 13 years old(some say sooner) that's quite a long time to learn a particular style. Good fighters actually want to try new trainers to learn different styles and new techniques so I don't buy the excuses on that angle either.
I guess some people are just too in love with Iron Mike bad boy persona, to be critical.
Edit because it was interesting too: