Do you mean the HW Toney on 'roids or do you think Toney at 160 would beat Tua? Moore was overpowered and outmuscled by Marciano, but he did beat Valdes who was 210 of solid muscle. Tua wasn't only strong and hard hitting, though, he had an extreme work rate as well and an iron chin. Not someone I'd like to give up 30-40 lbs to.
Both, though obese version of Toney might get outworked. Marciano was significantly more refined fighter though, I have never seen Tua pressuring anyone as well as Rocky did Moore.
If Tua only had to pressure guys who were arguably past it and former LHWs, I think he would look a lot more refined. I don't think Tua goes toe to toe with Roland LaStarza for 21 rounds, or loses many of those rounds either (as Rocky did). I don't think Rock would look super refined trying to pressure Lennox Lewis for example. As far as Tua vs. Greb, the only question is how far into the stands Harry would fly. This isn't A Farewell to Arms days, and Tua wouldn't be there to sing Greb's praises like Hemingway was.
If Tua ever fought someone even close to Moore or Charles in terms of skillset, he would look hopeless against them. We have seen him against Byrd and it wasn't pretty. Me neither, but Tua didn't look well in that fight either. Cool story.
Significantly more refined... Not that Tua was a 230 lbs JCC and Rocky was more tricky than what one would think, but I don't know.
No one alive has ever seen Greb fight, anyone saying Greb wins is going off what there mind wants to believe. How much is Greb weighing in this hypothetical fight? Did Greb ever fight a 220 pound ferocious Samoan with the power of David Tua and workrate he had in his prime? Let's say Tua is 220 and Greb is 160, has anyone here ever been hit by someone 60 pounds heavier that knows how to fight? Believe me it sucks, also just the force of someone that size hitting your arms can move you, physics can be a real b!tch when it comes to fighting.
In a full on fight? When was the last time a fight like that in boxing has been sanctioned? Do you think any current 160 pound fighter now could handle Wilder's power for example or do all them fighters that could handle the Heavyweights who have a significant weight/size advantage just magically disappeared over the years?
Yeah, Tommy Loughran had quite a few such fights for example. I don't know. The last time I can think of was Haye vs Valuev where the difference was bigger than 60 lbs. I think very few could and it's extremely rare, but not impossible. Fighting at HW is much more demanding and today, there is no point doing so financially speaking. About Wilder - Marlon Hayes lasted 4 rounds against Wilder and he was a 40 years old obese MW from the 1990s. I wouldn't be shocked if truly elite small fighters would last the distance with Wilder.
I’m an agnostic when it comes to Greb. But let’s say perhaps that a Tua in the hand (if you could hold him) might even be worth two Grebs in the burning bush.