I don't think Pantoja could beat MM today, let alone in his prime. I think that's easily the biggest mismatch.
GSP vs Edwards is likely an easy win for GSP. Edwards could pull off an Usman like Condit nearly did against GSP but I see him being mauled on the ground and jabbed to death at a distance.
I wanted to say Jones would beat Jiri/Poatan but did have second thoughts when thinking about how Jiri destroyed Reyes who was robbed out of a victory over Jones. MMA math is iffy though. I think Jiri is plenty good on the ground and is a better striker with just as much creativity as Jones so I think that would be a great fight. Jiri's biggest weakness is being hittable and I don't see Jones as a power striker who's likely to sleep him. Still Jiri was taken to deep waters by Glover and conversely we all know how Jones handled him. Poatan may get wrestle fucked but if not he's always dangerous and we've seen with Gus and Thiago Silva, Jones can be threatened by great strikers who can keep the fight standing. Even against DC who has excellent hand speed he was challenged in boxing exchanges. Jones is the favourite given his toolset but he's got an Achilles heel that both could possibly exploit in striking exchanges even if it's a rather small weakness.
Silva likely wins with style but Stricklands defense is quite good and it might be a trickier fight than one would guess, just ask Adesanya. In saying that Silva to me is vastly superior to Adesanya and I never understood any talk that suggested otherwise. I also don't think Strickland is ever going to be as dumb as he was in the Poatan fight again. He learned that lesson. In saying that Silva would be my pick quite easily.
The fight I'd most want to watch is easily Volk vs prime Aldo. Aldo's prime ended in the Mendes fight IMO as a war like that changes you, as does fighting the best of the best for that long. Both Mendes and Aldo were never the same after that one. It's not talked about lots but thats for my money one of the greatest fights in UFC history. So although Volk had a win over Aldo he IMO never fought a prime Aldo.