This is interesting, and you're right it is impossible. The difference lies between having marginal NFL players, and serviceable ones. I would say we've got too many marginal NFL players filling holes that would be better filled by serviceable players. That, and the lack of elite players makes us who we are. Below average.
I see holes all over this roster...at every single position, in fact.
JL, you mentioned LB and RB...well, from where I sit we have one RB right now (Miller) at a position where we need 3...and I have no idea what Miller's going to be down the road. At LB, Misi is deadwood, Dansby is vastly overpaid and likely won't be a Dolphin in 2014, and Burnett is inconsistent and also may be with a new team in 2014. We have no potential future starters behind those three...not one. So there's a bunch of holes at just two positions...and that's not even touching CB, WR, TE or OL.
This roster is UGLY. No, we won't have Pro Bowlers at every position...but wouldn't it be great if we could do better than mediocre at key starting positions, and if we actually had depth that could one day start?