The difference for me is that guys like Gaethje, Johnson and Poirer are all really more pressure fighters, they tend to need to be on the war path to threat an opponent. Gomi I think had more ability to pull out really big one off punchs with arguably more variety than Conor who depends so much on that left hook.
Again I think with Khabib it might be less a case of "who can beat him in his prime" and more "who has the most potential to upset him" and in that respect I think Gomi and Aoki might be the best picks, the most dangerous puncher and most dangerous sub fighter in LW history IMHO.
The Hughes fight was a bit unfair on Sakurai I'd say, he was rather at a low ebb their dropping quite a few matches and generally looking a bit bored and unmotivated were as around 05-07 he seemed to have alot more zip to him and alot more threat standing.