You can't rewrite history. This is not who he was, what he accomplished in his career speaks for himself. Nobody taked his victories from him until today due to clinical issues.
He is done physically, so it would be logical for him to retire some time ago, but he had a opportunity to receive millions by sylver adam during 4/5 years.
Based on this, he did what everyone of us would do, accept that contract and the opportunity to have more money in is account until the end of his life/make sure that his kids and family will have the best possible life.