First of all, a nollie is where you flex and pop off the tips (nose) of your skis onto a rail. A cruton or tanner grab is double grab combining a critical (inside edge safety) and japan (inside edge of opposite ski behind extended leg).
Second, Abma simply isn't as good an all-around skiier as Tanner. Sure, he can ski big mountain, but he can't do Pipe or rails even close to Tanner's level. He doesn't podium in most contests - unlike Tanner. His control in the air just isn't on the same level as Hall, Gagnier, Olsson, Rainville, Fujas, Wester, Thovex, etc....
Hall does some stupid things - getting arrested, dissing Bode and Daron publicly, and just acting so over-the-top all the time....Hopefully, he's maturing past all of it after his injury. He seemed real cool in his interview on Pop Yer Bottlez.
But anyway, he's too good at skiing for me not to be a fan of him. I hope he shows up to Pipe because that "Best Trick" contest was in serious need of his talents. His grabs are some of the best out there, his style in the air is so smooth, and his rail skills are ridiculous.
He is without a doubt the best all-around freestyle skiier right now - name another pro who can win Pipe, Slopestyle, and Big Air comps with the regularity he does. And it sucks that his ankles hurt whenever he lands a big jump. Hopefully, this season is better for him than last year's.