your RB2 is a bit weak, I would see if you can package one with one of your TEs for an upgrade. But yes knowing the league size and positions would be nice.
Real nice depth at QB, WR & TE and RB is loaded with potential but that can be a really good or really bad thing. I think J. Jones might be significantly better than last season. So I'd say RB is pretty much your only concern but imo not that great of one at this point. Overall a very solid team.