Biggest concern heading into the season?

[JustInTime]

iDL is almost ready for AARP cards but way better than what they were before. 

Jones will fair better with a true 60/40 split, but he’s sharing reps with a guy coming off injury. We’re a bad hammy away from extended Chandler time.

Defensive backfield is in flux with unproven starters.

OL has 60% of their starters coming off injury.

[StickierBuns]

As with any other position, injuries to starters won't be a good thing. No controlling that. And that will play a factor in who wins games and who doesn't, always does. Nobody cried any tears outside of Detroit when they picked out a few fans from the stands each home game to play on defense the 2nd half of the season.

Tough schedule that brings it almost every week. Trial by fire for Mr. McCarthy and I'm sure opposing D's will bring it.

[Knucklehead]

Punting

[Montana Tom]

Oh it’s by far and away the defensive backfield. The OL will be fine.

I’d say:

JJM
D Backfield
Injuries to oft injured players we signed as FAs.

My very first thought was injuries (or injury recovery from players hurt last season, whether its Darrisaw, Fries or anyone else).

[JR44]

The secondary for sure, we are replacing the steady Bynum with an unproven Jackson who has not gotten a lot of playing time. We all love Harry, but he has been on the decline for some time and not nearly the same player. CB is even more a of a question mark, Murphy is a good CB, but at the money we are paying him he needs to be a big time #1 CB, which he is not, think a lot have forgotten how often he gets picked on in coverage, a good #2, but not anywhere near that lockdown CB. Think Rodgers is being way overrated, keeps being touted as the nickel on an Eagles, which he was not, he was actually their 5th CB, last SB he played 8 of 55 snaps. Going to need someone like Okudah to have a career revival or a McGlothern to really develop.

[ArizonaViking]

First, the uncertain health of Darrisaw and Fries...when will they be able to play and how ready will they be. Like JR44 has said above about the secondary. They are still a mystery.

[Vanguard83]

I'm most concerned with our kicking game, but I ALWAYS am.

[greediron]

I am most concerned for our packer trolls who might just have a meltdown this year when JJM surpasses their "franchise" QB.