Well, maybe this is the year to get a RB......Your point about whether the incoming player can/will contribute immediately is the key point here.
There are few opportunities for snaps on this team... and almost none at some positions-- a true Edge, for instance where no one is going to play ahead of Phillips and Chubb.
The posters who honestly believe that an incoming 2nd round Tackle would displace Jackson are... optimistic at best. Yes, LG is a possibility, but that too is probably unlikely as I doubt whether McD is going to give that role to a rookie during this possible Super Bowl season... so I think we are left with looking for part-time players or guys who'll start in 2024.
So, I think we are back to TE and RB, where the right player might start... but both are cheap positions in the NFL, so we'd give up NBP's belief of drafting for cap relief (which I share).
As you've said, it's a good problem to have... and one that allows us to do a myriad of things in the first. Myself... I'd use those two top picks for one possible starter, and one stab at a starter for next year.
Kind of goes against my general philosophy, but there are exceptions to almost everything.