Well, I hardly watch MMA anymore, so I'm sure everyone itt is thrilled to hear my opinion.
Here goes:
Logically, we know McGregor is at a disadvantage against any good grappler that can get him to the ground (see Khabib). It also seems he struggles against top strikers, assuming they can maintain a solid gameplan (see Poirier).
Using these rather hazy criteria, I suppose I'd favour him against
- Dos Anjos (good grappler but can't take McGregor down),
- Ferguson (Ferguson likes to just bang, at the expense of a gameplan).
- Chandler (because I just remember his as being kinda meh back in the day)
- Oliveira (because -II-)
- Islam (unproven)
I'd say I favour Gaethje over McGregor.
And then I don't know about the other guys on the list because I don't really know anything about them.
All in all, I don't think McGregor should be underestimated. But he has a giant target on his back, and I don't think he's all that difficult to figure out even at his best. So I doubt we'll see a resurgence for him, at any weight class.
Hey, this was fun.