Sure, but there's some obvious factors:
1. Edwards is owed about $4.4M in non-guaranteed salary next year, and all of that is cap savings if they move on. Which will be crucial if Lamar is on the franchise tag. That's a hefty price for a complementary RB.
2. Dobbins is going to miss probably most of the rest of this season, which means he'll pretty much head into the final year of his rookie deal with something like 6-8 games played in two years. That's not something you can hang your hat on. At the very least, it kills any possible non-team-friendly extension he would get this offseason, which means he'll at least head to FA.
3. Justice Hill and Kenyan Drake are both UFAs after this season.
So for me, while we don't actually have an "RB1", I don't see scenarios where Dobbins, Edwards, or Hill are the RB1 on this roster come 2023.