We don’t have the level of talent to really make a comparison but washed up Jared Allen helped us a lot. Just in spots but he made a difference.
Age can be dealt with. Don’t kill their stamina and use them in the high leverage situations, as much as you can orchestrate that.
It depends, is he some kind of final piece? Maybe not for a SB but might be a difference maker in your division? If you can work the money out and it doesn’t restrict your other goals in terms of your roster then you probably do it.