I don't really follow... Any player coach, etc can leave anytime they want. There are just ramifications of such. The Bears did hire him. They also do hold leverage. I believe he cannot be a GM with another team unless he buys out his contract or something to that end. Maybe someone here can expound...
I do blame him for the failure of last year's draft. I think he got a little too big for his britches after the succes of the previous season. I think we took way too many long shots. I'm even skeptical Bazuin will ever see the field. Some of the first round busts, I understand. Some guys just crap out on the gambling table. However, even at some point, if too many crap out, the blame has to rest somewhere other than with the "chance gods". Jerry made the picks, he must be held responsible. Seems to me Billicheat doesn't have that problem... He's picking wisely. But, you are 100% correct when you say JA has done a good job of managing the cap and keeping our own intact.
I think your grade is quite high. I'd give him a B-, maybe B at best when you factor in gems like Vasher and Hester... His defensive grade could be an A, but his offensive grade is no better than C, if not worse...therefore you can't give him a better grade than B I feel.