Coaches have seen him in practice and he's played at Center for entire seasons in college, and as retired C Jason Kelce has stated, Center is the easiest OL position... (assuming you have no issues with the whole snapping/handling the ball thing, which more do then you'd expect). So maybe they aren't concerned at all...
But I'd like to see him play at Center before giving him an extension....
If he wants some of his unguaranteed money to be guaranteed for the season, then sure, he's probably going to get all of it anyways.
If the Packers were open to an extension anyways, then sure fine... but I'm concerned some of these guys might be on a decline.
Also, I believe some article suggested the Packers might already be over the cap for 2026... and that's without re-signing any of the 3 starting OL, and possibly two starting WRs, 1 starting ILB among others...
And the contracts they have to play with are Alexander, Jenkins and Clarks, which is not many to get down.