I was watching clips of David Tua and he possesed very similar tools as Tyson. Power, Speed, he was even built a lot like him. His problem imo was he didnt get inside enough and throw enough combinations. I think if Cus had trained him throughout his career especially early on, hypothetically of course, he would have been even more devistating and probably would have been one of the great heavyweight champions. This could have never happened of course because Cus woud have ben gone very early in his career but I can only imagine if he fought with his technique how he would have excelled. Personlly I think his left hook was one the most devestating punches in the divisions history.