The effectiveness of one's style can change according to the level of competition he is facing. Some might look absolutely outstanding facing a C level fighter and look average facing an A level fighter. It has happened many, many, many times. And just like it's happening now, people will hype him before he even starts facing someone really good.
Conor's speed, combos and style might look very impressive against people who can't box properly. But that doesn't tell us it will look great against one of the greatest boxers ever.
Frankie Edgar's wrestling looks great in MMA. But anyone here really thinks that he could just leave MMA and go wrestle one of the greatest wrestlers ever? Lol.
It's like looking to an MMA guy, BJJ purple belt, who submits people in MMA, and believe he would beat Marcelo Garcia in a BJJ match, based on the fact that he has won a few MMA fights with submissions.