Lord, he would drive everyone up the wall.
Since there’s no way he’d risk being maimed for life, he’d stay put– but not the way they hoped. This Dean has a Jacob around, and he’ll be bossing Jacob around just as much. He won’t be sitting around, waiting for things to come to him!
Sam would be driven up a wall, Jacob would have Dean likely in his hands much of the time to A) keep him from getting up and stalking off and B) to let Dean feel included, and Bobby’s just rolling his eyes going idjits.
Of course we all know if Sam was the one hurt Dean would insist he stay put and out of sight, so he doesn’t get hurt more.
Don’t ever leave Dean alone with his cast at any size.