Gaye is a bum, and Chisora was well on the way to embarrassing Haye. They had to end a round about a minute early in that Chisora fight to protect Haye. But it preserved him for his epic humiliation at the hands of Bellend, so alls well that ends well.
Haye was never ever going to be an elite HW. He moved up for the money grab, but he himself admits he cannot compete against the elite Supers. He was an elite CW and his career should be judged on that. In that respect he fulfilled his potential although did not have much longevity. That was because of his body breaking down on him. I am sure Haye is satisfied with his career and knows he couldnt have achieved any more than he did. As people here who have been athletes can testify there is nothing you can do about your body breaking down on you. Haye kept on trying to come back and make fights, but his body kept on breaking down on him to the point of retirement. As the Bellew loss proved, he should have stayed retired.
No. His style of fighting was not meant for longevity or an injury-free career, and I personally think he squeezed about as much out of his body as he was capable of. He could have had a much more glorious run if he stayed at cruiser and continued to win fights, but he wanted to chase the money, and that necessitated a change of tactics that turned him into the cherry picker he became. In hindsight I don't really begrudge him for that, since it's become clear since then that he had suffered from injuries for a long while, so he quite literally needed to pick his battles to ensure that each one moved him a step closer to Wlad, or another lucrative bout. He had one of the easiest and most manufactured runs at a huge-paying HW unification fight in recent memory, and a lot of that was down to what he himself did to put himself in that position. Had he fought his way up the ranks like say Adamek I think he would have either copped a loss along the way or been too physically worn down to be anything other than a punching bag. Even now he's still got fans clamouring to see him, even after it's clear he's completely shot. He really knew how to play the game to his own advantage, and in a corrupt, soul destroying sport like boxing I'm actually kind of pleased for him.