Carwin wouldn't shoot for a double against a little midget like Tyson when he can simply clinch him and throw him. Not that Tyson would hit him anyway. Carwin hit Lesnar because you know, he actually can sprawl and Lesnar's takedown was telegraphed.
Also, you still have zero point. We are talking about a fighter who had a 2 year prime(according to his nuthuggers) and never beat anyone other than a blown up Michael Spinks.
Most overrated fighter in the history of the sport.
Prime Mike Tyson dominated all comers, and knocked them silly. Easy to say the division was soft, but that's reverse logic - Tyson was that good and made the competition look bad. (same happening with Klitchkos today, imo).
Heavyweights were literally afraid to get in the ring with Tyson because he had such an unorthodox style and ko power in both hands, and he was so quick and could hit (with ko power) from any angle. George Foreman said he'd take on anyone except Mike Tyson. Ditto Larry Holmes....these are guys who fought Ali, too.
Tyson's downfall was two-folded. One, he lost his drive and some of his skills, too, but equally important and often overlooked is that bigger boxers watched film on him and figured out his style and how to beat it. Happens all the time in boxing, mma etc - a new guy comes alot with an unorthodox style, but when the competition figures it out they start getting beat ( fwiw, I think this might happen with Lyoto Machida ).