Conor was blessed with favorable matches his entire career. He was good - no doubt about it, but was severely overrated.
The only real unfavorable match he won was against Chad Mendes, who was off the couch, gassed, and made some questionable decisions in that fight
He was one of the top fighters in the world for sure at FW, but he never defended his title, and then when the money came, he went full diva mode. He wasted his prime years attacking buses. He will never be the same fighter ever again, regardless of what he wants to tell his legion of fans. The mentality is completely different when you are coming up the ranks versus when you already have it made and are fighting for a paycheck, while getting older too.
It also doesn't help that he has zero fighting spirit and crumbles when faced with adversity. This isn't something you can change or train for
Conor will definitely have one or two (tops) fights in the UFC. But as far as his relevancy goes in the current landscape, it is non-existent
Summary: Great fighter, crisp striking, mediocre grappling, current instagram diva, irrelevant