As much as I fear our need for talent at OLB, I think that objectively our biggest weakness is at QB. I love that we have our QB of the future and I think he will grow into a fantastic pro (hell, I bought a #10 jersey), but for the next season I have more question marks for him than I do for OLB or OL. Trubisky's development is going to be more determinative of the game's outcome than the progress of our LBs.
Can Mitch lead a pass heavy attack? Can he command a complex offense? Can he read exotic defenses and audible at the line to counter them? Can he juggle several receiving options? Can he overcome competing egos and lead a team? If I weigh that against the questions I have for any other position group... Well, my anxiety for Trubisky is much higher than any defender coached by Fangio; we saw a lot of guys overachieve under Fangio because he knows what the hell he is doing.
I think Trubisky has the athletic traits to be a great one, but he has a lot of development to go, and he needs to show it on the field. We put so many pieces in place for him to make a big leap in production, but I want to see him actually take that step before I stop worrying about his inexperience relative to his peers.