This is the other element. I said before, during and after the draft that I think they're okay with Te'vi, if he has to start. The Fisher signing is kind of a bet that he'll get back and be able to play at a reasonably high level, but if he doesn't, they're okay with Te'vi.
You mentioning him as a experienced vet will make him pretty valuable to help Tevi for whatever games he has to play.
The best case scenerio is Tevi plays great and maybe actually becomes the future LT.