I hear you... but the same decision makers had confidence in the backup QB's a year prior.
Back to Bak... I don't care where he was drafted or what his measurables are, the kid proved that he can play a crucial position as a rookie. Doesn't he get the benefit of the doubt for off season improvement like everybody else?
I see Bak holding down LT.
They are also the same decision-makers who picked Rodgers when they didn't need a QB...ha ha !
Bak will most certainly improve and he rarely made the same mistakes twice last season. He meshed well with Sitton, stayed healthy himself, lots of positives.
But even after you swap out the carburetor, put on new tires, add the glasspacks performance exhaust system... its still a Ford Mustang.
Which is why he lasted into the 4th round
Sherrod is/was/might be... a Ferrari
Bak played great for a rookie, and was an absolute godsend in 2013.
But if you looked at his play from the point of view- "Is he a top LT ?", the answer is no, he wasn't. Will he be ? We'll soon find out; should be quite a battle
GB needs better play at LT and it'll either come from a vastly improved Bak, or even better, a fully-recovered Sherrod. I'd put the floor for 2014 LT as "a better Bak" and the ceiling as a "recovered Sherrod"
Competition will settle it, but if you had to bet on a race, most would take the Ferrari
(...so long as its not in the shop for repairs 
)