No, but both IR and LTIR free up a roster spot, which was Bobbop's point. We could have easily afforded to carry both Gettinger and Nieves.
It doesn't work like that...
We could have afforded to carry both Gettinger and Nieves, but that actually reduces our total annual cap space.
IR cap space only allows you to go over the cap, so anything you use until you go over... counts against. So carrying both of them means less cap space. Even with someone on the IR.