IF the rumors about who Chuck would fight were true (which it isn't), that'd be your answer right there. I don't know exactly what has happened with Chuck health-wise, but certainly age and years of fighting are catching up with him, and it has shown in the ring. Multiple knockouts are never a good thing.
Supposedly Tito is doing really well, and although I have never liked the guy and have never considered him a great fighter, I think he's not lying when he says things along the lines of the best Tito fights are yet to come.
Frankly I'm completely uninterested in chuck vs tito. I get bored with fighters facing the same opponents over and over. Please don't make Chuck fight Tito, please don't let Mir fight Lesnar. There are plenty of better and more interesting match-ups.