Well they'd have 3-4 guys they are comfortable with playing D minimum for the one spot, and they don't have to declare that a NI will be used at a certain position, just that a NI will be on the field at all times on D. So right now there's Thomas, Briggs, Miles, the DB's, Griffiths and whoever we draft, plus Hansen who can't "start" as one of the 7 but unless it changes for this season he can sub in for anyone.
Worst case scenario if Thomas and Briggs go down you throw a guy out at field corner if it comes down to it, 2/3 of the QB's in the league can't make a throw out to the field, you just gotta switch to a zone that will make it harder for the O to isolate that guy. **** that used to be the gameplan...remember Matt Bucknor?