No we don't get bent because in weird NFL contract landscape the guarantee is built into contracts in the way of signing and roster bonuses.
A factor that all players conveniently forget when they get to back end of below market rate deals in their eyes because all they look at it is the current yr salary.
NFL should adopt more of NBA model, all contracts guaranteed and no re-negotiation during a contract. This helped end the annul whining by Scottie Pippen with Bulls. And MLB has no hold outs as they are all guaranteed.