I read a great book on Tyson like ten years ago.
Supposedly Don King made him go to all of these press events in Tokyo instead of training. While Douglass was sparring and all of that, Tyson was eating sushi at PR events and such. Supposedly the ONLY thing he did for the fight with consistency was run, but he didn't maintain sparring, mitt work, or anything else important.
This may be true. However, as soon as Tyson lost, and I remember this clearly, everyone from media to friends at school automatically came up with reasons/excuses, whether they'd seen the fight or not. Its normal - an 'unbeatable god' vs someone without a big name, and the lesser known wins - gotta be a fluke, or an explanation (Anderson/Weidman?)
But, watch the fight, and the commentary, and if you were old enough to watch it with people - fucking nobody was saying, "Tyson looks like shit, or like he hasn't trained" "Tyson's gonna kill him, here it comes" was more like it. There was a subdued confusion that grew as rounds went by, and then Tyson DID start to look like shit, until dropping Douglas the round before Douglas beat him. Douglas showed more heart in getting up there than he did the rest of his career, and it was probably due to his mom dying. Tyson looked worse and worse as the fight went on, but THAT WAS TYSON. It was rare that his fights went deep, but when they did, he always at least showed signs of wilting. He was used to getting people out early, having them fear him, and physically he trained to get them out early. once a fight goes past 15 minutes, the anaerobic/sprint-type athelte's slow down more than the skinny Diaz types. Throw in a weak/spoiled mentality, and things get interesting.
I buy that Tyson didn't take it seriously enough. But I suggest that Douglas fought above himself, and that Tyson was a different guy if you could get him into deep water. Rousey may possibly be the same. I said this all about Lesnar years ago, and was ridiculed. He was more ridiculously mentally weak than I imagined. I said this all about Jones v Gusto, and I was wrong there - he really has guts.
Until its proven, its a question mark. Good matchup UFC. I wouldn't throw a cent on Holm, but its more interesting than watching some broad who's just going to run straight into the Lion's Den, without the tools to deal with the lion.