Then he may get blasted by the league... while under contract he has zero leverage. If the team and league lets him slide with the back injury excuse, all is well... but if they press it, and they can... he either plays or ends up with millions in fines and loses his UFA status next season.
Some teams tolerate hold ins to salvage a relationship with a player... others push the issue, often ending up with the player being traded..
Porter has zero legal leverage right now.. its not the Bell situation because Bell never signed his franchise tag and wasnt under contract..
Porter is simply following what Jalen Ramsey did years ago to a tee.. including the faux back injury..
Since that time, several players got burned trying to replicate it with less accommodating teams..
If Porter holds out from this point forward, the Steelers are allowing it in order to salvage the relationship..