Let's say the Dak deal doesn't get done by week 1.
I know there are people out there (not too many, but some) who really think Rush is better than even Dak (which would make him a lot better than Lance) but if Dak should get hurt Lance should be the #2. It would help to see how he manages a game. I can't (or won't) imagine a scenario where you give up on a 4th round pick after 2 years, which Lance essentially is.
I think, regardless of whether Dak gets re-signed, Lance WILL BE re-signed to an average backup deal. Hell, the Raiders gave ~$10m to Minshew.