I'll completely agree with you on Mathews, he should be more than an alternate. I don't think many people have noticed him, but damn, he's a beast. He is the only one where I looked at the selections and was thinking "how the hell is this guy not on the team"? (Well, him and London Fletcher, but, clearly he somehow isn't allowed to play in the Pro Bowl)
Grant, on the other hand, was more of a toss up as people have mentioned in earlier posts.