First question, they know what’s needed. Everything done is scrutinized down to the last molecule.
Every play by every player , every group from every angle and we only get to see what these players do in games.
You don’t see workouts , training, position specific drills, practice, testing physical and more so testing in meetings.
How assignment correct are they? I would think that is a big one for rookies.

The entire Training staff, Doctors, dietitians, sports medicine people , Chiropractors any thing or anyone that has to do with the health of the team are the finest in the world that keep up with every medical, physical, psychological conditioning all year long.
The players go to position specific specialist for off season training.
The NFL is a multibillion dollar business it’s not Vince and two a days.
The NFL is 24 -7.

As far as the OL coach I get the lowest common denominator feel for that.
Dive a little deeper and I think he did quite well with what he was given.
There was question to start the season with multiple OLinemen injured through out training camp.
And that trend did not stop.
I’m sure someone can tell us how many missed starts there were across the front.
How many different OLine combinations there were.
And your best Olinemen had 12 starts but fewer finishes.
Your Center gone, your starting LG in and out, a rookie starting at RG after Morgan’s failure. I don’t write him off but he has to have a great offseason.
I can blame bad play but not injuries.
Walker will not be back , Jenkins gone, Tom neede surgery,Banks just needs to heal up. It would be good for him to get though the offseason, training camp and preseason games healthy.

What would I do? Fire the Special Teams coach. Way to many big plays against his Wefense in critical games.