I am certainly not an NFL salary cap expert. Not even close. But I can add. And I just don't see any way the Green Bay Packers can extend all of their "Big Three" 2021 free agents. At least not without critically gutting the rest of the team. One of them for sure, maybe two, but I don't know how they can squeeze in all of them.
The big three are, of course, defensive tackle Kenny Clark, left tackle David Bakhtiari and running back Aaron Jones. One would have to think each of them will command a deal at or reasonably close to the top salaries at their position.