It's very possible that there's an alternative explanation for our vanilla run game and Geno lining up excessively in shotgun: Grubb is scheming around a bad OL. Typically, when fans ask why their team isn't doing X, the answer is that their personnel aren't good at it, which they aren't going to say in public.
I mean, you guys can't call out Connor Williams stepping on Geno's foot and then wonder why Geno is in shotgun so much.
Anyway, get Bradford and Jerrell out of there and we'll see what Grubb can do. In the meantime, I've seen enough interesting things (inside WR screens last week) that have showed good execution for chunk plays, so I know something is there with Grubb.