He’s probably a top 8 qb at worst when healthy. Not saying I’d start a franchise with a 35 year old, but if he was 28 and playing like he was, he would be getting hyped as a top 3 franchise type QB.
For better or worse, they could run it back a couple years, but even with a bit of a veteran home town discount with Cousins, there's going to be a ton of money tied up in Kirk, JJ, and Hock. Depending on Hunter, it could be interesting.
People compare QBs and put Kirk lower, but you can't really do a good job comparing a QB until they are on a big cap eating contract. QBs get evaluated on W/L. Well, that looks a whole hell of a lot different when you have a good QB with a low cap hit, vs. that same guy on a $40 M plus cap hit.
When you have great weapons, a good line and a good to great defense, it's easy for a QB to look good and win games. Allen, Burrow, Herbert, Dak, on and on. These are different levels of guys, but they all are having tougher times winning games now, and it isn't like they got worse.
For all the skills and obsession Brady had, one of his superpowers was willingness to take way less than market value. This was not a marginal thing, and probably is the difference between winning a couple of those Super Bowls and not. People talk all about the great things both Brady could do and all these great moves by the organization, but really you have the greatest QB of all time taking a salary that allows you to add 2-3 more All Pro guys. That pretty much dwarfs all the other personnel decisions.