Injuries definitely get taken into consideration when renegotiating a contract their is a reason why D.cousins in on a 10 day contract now with the Clippers, when he was on a 100m+ contract a few years ago.
There is a reason why NFL players outside of the quarterback don't get paid what they deserve, it's a dangerous sport, you are likey to get injured, why would the team invest x more dollars in you than they should.
So his injury record will & should be taken into consideration when he sits at the table.
All that being said, I would renew him for what he is on now, gonna be difficult for us to negotiate a paycut, he is in the last year of his contract, he will just wait it out & leave on a free, at least if we renew we can get something for him, if he continues to play relatively well, though below all our expectations.( Expect total football 😂).