I don't think anyone is going to be terrified of Gauthier unless he improves a lot. He's not even a "match-up terror" in the QMJHL, mostly against players that are younger and much smaller than him. Hard to see him terrorizing NHLers any time soon.
Not terrorizing as in physically. Terrorizing as in good luck trying to get the puck off him along the boards. I don't think you realize how good he is in that regard. He has very good hands for a guy that size, he keeps possession on a elite level.
Have you even watched him play? Or do you just look at stats?