Lennox fact - Lennox and Rocky Marciano are the only two heavyweight boxers to have retired having beaten everybody they stepped into the ring against. Lennox needed some second chances, but that's an interesting fact.
David Tua is one dimensional. He has a really big left hook. His biggest problem was that he didn't move his head well, especially has he aged. Klitchko wouldn't even need to take any chances to beat him. He would jab from a distance and as soon as Tua got in range of his big left, Klitchko could hold him. That fight would be very one sided.