There is some talk whether Fantilli ends up being a winger instead of a center and while no one can really see what the future holds, here is my thoughts on the matter.
First of all, Fantilli has spoke out that he sees and feels himself as a center. He wants to play center and improve as a two-way center.
And he certainly can, tools-wise, become a good, even great, center to the NHL. He has hands, speed, grit, will, determination and enough smarts / hockey IQ to pull it off. He wont likely ever be a Selke nominee, but that is fine.
He is already learning from Monahan and adjusting his game as a 20 year old, far far away from his prime. If you expect him playing as a smart classic two-way center this season, kind of comparing him to Monahan, you are doing it wrong. He is on his own path, learning and adjusting. And while I think he is already showing some improved details, he is by no means there yet, but lets give him time to grow to his full potential as a center.