The difference is that when Max came, he was effortlessly thrown in with Cord, Tina and the Buchanan's and it gave him immediate character credibility & distinction. They've given Cutter this "posse" of newbie females, but they haven't given him any important ties to any seminal character. The interaction he's had with the more important players has been fleeting or petty. He is too isolated from the rest of the show and is spending too time doing piddly things...like talking to stuffed porcupines and having amorphous conversations about his questionable past with his stripper sister and con artist GF. I can't easily get attached to him like that.