Hell no. Moorer KOs him. It's a toss up vs Schmelling. Dempsey KOs him. Tunney outpoints him. Patterson KOs him.
I don't agree with White Bomber the majority of the time but his picks here are solid much as it pains me to say. Crazy is picking Conn over Dempsey and Marciano.
I have seen folks list Tua as fast, at least of hand. But he was not glacial, & not below average hand speed for a modern HW. To be that slow you gotta be comeback Foreman or slower. The "could" in the question means we literally could pick many who have a small to remote chance, a better way to word it would be something like "has a decent chance", or say at least 1/3 odds. Many are as heavy or more than prime Tua-especially if you are going by weight, which was what you indicated-& are not slow. Use height per weight or body fat percentage you are closer to the truth, but you must know that some with even more body fat are not slow-like Tyson Fury, whose hands are fast for a HW not even considering his size. Even Ruiz has relatively wuick hands...
Sure, but Tua & many guys were not that slow-some big guys are pretty fast. Could Conn stay away long enough to decision Tua? Maybe, but "The Terminator" would be much nest incarnation as mere "Tuaman".