Holmes was about five years past prime. He couldn't move like in his prime. If you can't move well and drop your left hand too much against prime Tyson........................
Well, he couldn't move like he did in his prime and prime Tyson was much better than Mercer and Holyfield didn't have near the power of prime Tyson. It's a styles thing, and an over the hill Holmes who couldn't move well and still had the bad habit of dropping his left hand was tailor made for prime Tyson.