It's possible we don't have a clear cut 2 this year. Part of why you want Jacobs is to have a primary carrier. What on-field ability we lose with Jones leaving is the receiving threat. I'd look to scatbacks that could be dangerous in space. Dillon wouldn't be a bad re-sign, if only for familiarity.
It's possible we end up with a 3 man rotation that is vaguely similar to 2004. Your main threat (Green = Jacobs), your almost good enough to start player (Davenport = Maybe Dillon?) and your receiving threat/3rd down back (Tony Fischer = ???).
That is of course a luxury, doesn't translate perfectly, it's been 20 years, and what teams expect from their backs is different, but it helps me wrap my head around it.