I agree that Ultimate Warrior's run was too short. Plenty of people comparable who won't ever get in.
Slaughter is a very interesting one for me. Would probably be in already if he didn't choose GI Joe over McMahon in 1984, because he was the #2 babyface behind Hogan and would have probably turned heel years earlier and had a big big program.
Same can be said for Snuka. Like Slaughter, was headliner in a lot of places, including WWF when Backlund was champ but really Snuka was the headliner for some of that period, good Japan runs, and was the #2 babyface when he quit in 1985, and probably would have turned heel at some point.
If you think about it, Orndorff probably got the Slaughter/Snuka spot in 1986. And look at the business that did, selling out Toronto and everywhere else, and while I like Orndorff, imagine how much better that would have been with Slaughter or Snuka, who were much bigger stars and lap him in charisma.
Man, Owen is tough one for me, it would be 100% workrate, plus the Bret feud. Really an innovative guy, his Japan stuff (particularly against Liger) was ahead of its time, same for his stuff in Calgary when he was lights years ahead, i'd really like to say yes, but then you have guys like Curt Hennig who were every bit the worker (although not as innovative) but Hennig had more runs on top.
The problem with Hennig, is he has the dubious distinction of the worst drawing feud during Hogan's peak. Some of that in unfair, because it still did well, and Hogan's run was at the back end. Also, Hennig was world champ right as AWA was starting to die, more bad timing, because that avalanche had already started and nobody was going to stop it. He drew with Lawler in Memphis during that period, but I mean, who didn't? As far as influence, Hennig is one of the most influential wrestlers of his era, look no further than a Dolph Ziggler match, or Shawn Stasiak, or Curtis Axel, or Rob Conway, or whoever else has tried to match his swagger & steal his gimmick over the years.
I can't see Owen getting in ahead of Hennig.