Well, you've opened up the door so I'll step on through. Just from the Flyers, Couturier is CLEARLY better than Nico. Giroux, who still plays center at times, is CLEARLY better, and a legit argument can be made for Hayes to called better than Nico.
Now I know you are going to say G is a wing now but the truth is he plays both and if he were on a team that lacked center depth he'd be playing their #1 center position. As to Hayes, which I'm sure you're going to say is laughable, Hayes just this year has more goals, more points, plays ALL situations (pp, pk, 5v5, 3v3, shootouts, etc) and is far superior defensively and away from the puck.
I'm not suggesting that once Nico hits his peak (he's not even close to his peak yet) that he won't surpass Hayes but you didn't say "potential" or "in 2 to 3 years", you said right now and right now I just provided you with at least 2 and likely 3 centers just on the Flyers who are superior to him right now.
Should we continue with other teams or would you like to retract your statement?