Don't get me wrong, I'm a big Canes fan, but I tend to think Smiley is a really complete guard, while Carey will be decent but not special at both guard and tackle. He looks good and plays good, but I just don't see him dominating at pro level because nothing truely stands out. Same as Grove; aside from his leadership, Grove is a good Center. Not excellent and nothing really special.
Gallery can't really be compared to Gross because Gross is a natural RT. Also, I'd argue that Walter Jones has been better than Pace each of the past 3 years, but that's irrelevant.
Gallery has a real mean streak and has very little fat on his body. I was surprised just how big he was without much fat when I spoke with him - he could easily put on 20-30 lbs with no problems.
What I like about him is he plays physical and nasty, but moves like a TE (which of course, he was,) He just glides out there and I can see him dominating, because speed rushers will struggle to get round him based solely on speed.