Nate wasn't checking kicks vs RDA, and started out much the same vs Johnson, allowing him to rack up over 15 low kicks in just the first round ...but then he started checking them and did an excellent job of it.
So you can't say that Nate doesn't check low kicks. If he feels that the opponent is trying to work his leg, he will adapt and be very effective defending them. You can't ignore the Michael Johnson fight and pretend like it's the same old Nate.
That's one.
Two: Conor does not have a good roundhouse, especially not a low roundhouse.
Three: Even if, by some miracle, Conor shows up to the rematch with an excellent low kick, it will not affect the outcome of the fight unless Conor's cardio holds up. That's a major problem. In the first fight, he gassed early in the second round and worse than that, he folded almost immediately once he started getting hit. Consider how much abuse Cerrone and Johnson took from Nate and tell me that this doesn't say something about Conor's mental toughness.