No one looked 'dominant' at the time. Evander was champion but he struggled with Foreman and had a scare against Bert Cooper. Tyson had two wars with Ruddock. There's not much else to note from that year.
Even though he's ranked #3, I say Bowe was the best fighter head to head that year possibly. Possibly. He was better than Lewis at that time, but lacked the confidence to beat him. So let's say Lewis dominates Bowe the way he did in the Olympics - I don't think this lanky version of Lewis was ready for Tyson at this time. There's so many ways this thing could go, so I hesitate to pick a head to head favorite.
Re: 1991 -Tyson, Lewis, Bowe , Foreman, Holmes and Holyfield
1991 was a long time ago. But I don't recall Riddick Bowe becoming HUGE until he won the title from Evander Holyfield. In 1991 Mike Tyson was still considered the best. Evander holding the title didn't mean much to people as they expected Tyson to be more focused after the Douglas loss and that he'd crush him.
I mean, Tyson already beat Tucker, Ruddock and Witherspoon. Michael Moorer and Mercer were still novices, and Moorer was barely a legit heavyweight anyway.
Who does that leave? Lennox would be too over anxious and leave openings and get kayod by Tyson. Evander may or may not have a chance. If he beat Cooper you could certainly argue he would beat Tyson too. Could go either way. Bowe is the only ranked heavyweight that year that I see whooping Tyson, although Tyson would more than get his licks in too