Well I didn't say he was good at it. But that is the general idea; get ahold of them, pull them to you and lock them in. When a three hundred plus pound man gets ahold of you like that, any quickness you have over him is nullified.
That is why he gets blown up like a bomb at the P.O.A.
And why he gets "locked up" by a 250 pound linebacker. He should be pushing linebackers backwards. Just on his sheer momentum, from his fat head, alone.