As far as grading the FO, I'm going to tie my grades directly to the play of the tackles this year, for two reasons:
1) With all the offensive weapons and the decent defense we have, the play at the tackle spots will ultimately be THE difference between 4-12 and 10-6.
2) If Walker and Butler are glaring weaknesses this year, it will likely mean that at the end of the year we do not have a clear sense of whether Trent can be our franchise QB going forward. This will murk up our draft priorities.
3) Letting Peters go and then drafting two guards effectively blew up the line and put both Walker and Butler at new positions.
The success of the Peters-for-a-LT-already-on-the-roster idea points directly to the competence of the men in charge (especially since they have shown no interest in Levi Jones as a LT insurance policy). If they couldn't get this right, they deserve to be gone. If this gamble pays off, they obviously deserve more time to put the remaining pieces in place.