50 years eh...so from circa 1960 on. Half the time he would be the fox in the hen house and for the other half he'd be one of the hens. I personally don't think he makes the top from the mid to late 60's
to the same time in the seventies. I think he would even have his hands full with guys like Quarry.

In the eighties/nineties he and Tyson would look very Hearns/Hagler like. Jack doesn't make it out of the ring on his feet. Lewis, Ruddick, Bruno all beat him. Toney Tucker would probably pick him apart. He had real issues with anyone who could box a lick. He was the last of the grapplers and actually studied in right up the the first Tunney fight where he was the one that asked for the new neutral corner rule and then ignored it giving Tunney the long count. Jack beats the Mitch Greens and Jessie Fergusons of the world though.

So now to this era. I think Wlad and Vitali destroy him although getting a shot in on the younger brother could change things. I don't think he gets that shot in on the present day Wlad. I think Haye would be to much for him athletically but I think he would walk down most of the others in this era. Speaking of Willard well that's exactly what Helinus would look like. There is just something really lacking in the so-called heavyweight contenders of this era. Its like they don't really want it. Drunk on the riches of mediocrity and lacking that real edge. Dempsey avoided/ducked several fighters in his day including little Greb and Langford.