1st Round KO
Lennox is a formidable boxer , but even a 96 Tyson is too much for him, in my opinion.
If Bruno ties up with tua, throws his close range mid grapple punches and catches Tua with a heavy punch when he tries to break away, I can see...
A '96 Tyson KO's 98' Lewis in round 2 or 3
I think Bruno's strength and punching power could see an early TKO on Tua Wouldn't be a pretty fight - lots of clinching from Bruno's end.
I would say Holmes would beat all of them to the 15 rnd distance. I think Lewis would trouble him mid rounds and hurt Holmes with his big rights...