I think prime Holy beats ANY Lewis, though probably by decision. Holy's Warrior Spirit would get the better of him against 80s Tyson, though.
Personally I'd rate a prime Lewis ahead of the other two. I think Tyson / Holyfield are of a similar level in their respective primes. THAT SAID I also think that they'd be in a lot closer fights than they were when they actually fought. Let's be honest, prime Holy or Tyson clipping Lewis a good one or beating him would not be that much of a shocker.
I'm not positive about Holy doing that, but a decision for sure. I don't think even Steward Lewis would make it as long as Holy against prime Iron Mike. Holy had a significantly better chin imo. That said, Lennox is easily a top 6 ATG and massive credit to him.
I've got Lewis at #3 and he could be argued a place up or a couple down depending on what your criteria are. I have Wlad at #5 so that's 2 ATG HW's that Steward has in the top ten at my reckoning.
I'm thinking that, in 3-fights, about 1.5 yrs between fights, boxers 'aligned' so their best 3 yrs overlap: Lewis 2, Holyfield 1 I suspect Holyfield needs a fight under his belt to figure out the best way to fight Lewis. (So, if it's a prime v. prime one-off, I pick Lewis). Holyfield 2, Tyson 1 But I'd expect a Holyfield sweep more than Tyson 2, Holyfield 1.