Larry Holmes was a great champion as a fighter, but time has proven him to be a bitter, unforgiving, insulting guy.
First he goes after George Foreman for knocking out Michael Moorer the way he did ("Mohrer was beating him up!", he protested on Ringside), then he doesn't shake Butterbean's hand after Butterbean was just beating him up in parts of that fight, and is content to sit on his hands and let posterity sing a song for him (and for Muhammad Ali, who at times he writes about as if he really hates him).
His comeback--putting himself in the ring with Mike Tyson at the age he did--and just generally his willingness to fight anyone should have been enough. Boxing doesn't bring everything home to the right people. I'm surprised he hasn't just staged something incredible to feel better about himself.