The Tua, who had the most fearsome slugging matchin the history of the division with Ibeabuchi, would run over either of the Klitschkos. They have had things too easy, too long.
It doesn't work. Lennox didn't risk nothing, cause he was afriad of being hit by a punch and knocked out. Vitali has far more faith in his ability to take a good shot, so he throws more punches and wears the opponent down. He is a real warrioir. He would not stop Tua with a single shot, but he would hurt him round after round with many, many punches. You can't take power-punches from a big-hitter like Vitali forever. Vitali Klitschko at his best could very likely stop a prime Tua. At least it's more likely than Tua being stopped by Lennox.
Klitschko would win a UD, Tua would have problems with his jab, height, and awkwardness but may win an early round or 2.
Klitschko would win a UD. I can't see him stopping Tua. Tua was able to land on the taller Lewis so it's not beyond the possibility that he connects on Vitali as well.
Vitali clear shut out UD. Tua is one of the most overated fighters in the history of the heavyweight division.