Hes also got less reach and yes he was slower overall
He was also beaten to the punch by randy couture of all people , and as for nearly impossible to hold down he was ragdolled by randy and rampage so lets not make him out to be something he wasnt.
For strength id say the larger more athletic man is probably gonna be stronger in the clinch , id picture bones tossing prime chuck around failry easily.
He doesnt need to rack up that many wins in the modern era to prove hed beat a guy from an earlier less technical , less athletic era (where the best where in pride anyway) , we can clearly see from watching both men in action gus would beat him everywhere.
Just because you say Chuck was slower than Gus doesn't make it so. I'll repost the gif of Chuck dropping Vitor:
This is in close range with Vitor Belfort ffs. I've never seen Gus show handspeed like that. Nor have I ever seen Gus show the speed + killer instinct that Chuck used to finish the Ortiz and Overeem fights (can also include the Mezger KO but I'm only allowed 6 gifs):
Perhaps if Gus did have Chuck's combination of speed + power + killer instinct then Gus might've been able to finish off Jones. We were all waiting for it to happen in that fight but it never did. Jones is obviously far better than Tito or Reem, but my point is that I've never seen Gus string together power punches in bunches like Chuck did. That ability to me is practically a requirement if you want to finish a guy with a solid chin and quick recovery like Jones. Gus tried picking him apart but it didn't work, at some point you have to overwhelm him and I think prime Chuck had the ability to do that.
Chuck was ragdolled and held down by Randy in their first fight. It's been said that Chuck didn't take that fight too seriously and wasn't at all prepared. It makes sense considering that's literally the only time that anyone's ever done that to him. We all saw what happened the next two times Chuck fought Randy.
Rampage is one of the strongest LHWs ever, if not the strongest, but he did not ragdoll Chuck. Page beat him up standing and finished him with some brutal GnP to the body after Chuck was already pretty hurt. That does sound like something Jones is capable of repeating (see the Shogun fight), the hard part for Jones though would be doing the damage standing that Rampage did to get Chuck to the ground. Jones doesn't hit nearly as hard as Rampage nor is he the boxer Page was. iirc Rampage got Chuck down by dropping him, not with TDs, and throughout the fight Chuck was able to get back up until the end when he was taking heavy GnP and his corner threw in the towel. This gif is how I remember that fight, Rampage beat Chuck up but he didn't do it by ragdolling and controlling him on the ground:
I do agree that Jones would have the advantage in the clinch. The concern for Jones though would be getting in Chuck's range to get to the clinch. Glover is no Chuck, despite what some people might say. I've never seen someone consistently drop people with quick precise power punches in close quarters like Chuck routinely did:
Both Jones and Gus would have to try keep Chuck at distance and pick him apart. They're both capable of doing that if Chuck lets them, but I believe between prime Chuck's chin and skill at cutting off the cage, Chuck might be able to get inside and make these fights very interesting.