How does Conor get a title fight if he wins his match against Nate Diaz?

Nate Diaz doesn't fight at 155 pounds anymore, if you have not been paying attention. So a catch weight or any fight outside of 155 pounds, where Nate Diaz isn't even ranked in anymore, wouldn't qualify towards any title shot whatsoever.

Unless you have not been following the sport for the last 5 years, Conor Mcgregor is 1-3 in his lightweight career, and is currently ranked #9, so unless he gets a dominating win at 155 pounds against a ranked opponent, or Charles calls him out [which is unlikely given the fact that Darius and Islam are fighting in the title eliminator] your comment makes zero sense.