I think its too late for Tua to defeat Wlad. Tua is only getting older and slower so I'd have to see him do much more before I change my mind on this. But I think no one can be surprised if he did KO Wladimir. Murderous punch vs. Suspect chin is always a one punch away fight. But I think Wlad would play this as cautious as if he were taking on a prime Tua and then would win a jab, jab, jab, occasional right hand fest. Coming back at the age of 37 is hardly a good idea. Unless he needs the money...