I could honestly see anywhere from high 20’s (with say, top 6 odds) to low 40’s and sneaking into the bottom of the play-in (though that will be incredibly hard in thw West).
The addition of Paul and Barnes is not just about what these 2 actually bring as players (though a good PG could make a huge difference to Wemby, as we saw with our on/off numbers last year with Tre Jones), but about overall depth and roster construction. Suddenly Tre Jones is a full-time backup, Keldon is a clear bench player, Champagnie is a 9th/10th guy, and guys like Branham and Wesley are true end of the bench guys. Moving these guys to their more natural roles, and not asking them to do too much could suddenly make a huge difference to performance and wins and losses - especially if Vic makes an improvement (and just plays 5 all year).
But I also see a world where by January the team is clearly off play-in pace, and decide that the best outcome is to just soft-tank for those top 5/6 odds. See if you can any positive trade value for Barnes or Paul (otherwise probably buyout Paul so he can go to a contender), gives guys extended injury rest, and pump minutes into guys like Branham, Wesley and Cissoko, to see if they have any future in the league. We have done it before, and could easily jump up 5-ish lottery places if we time it right.
Just from the Spurs POV, if you include stash in Europe, then guys like Manu, Scola, and Splitter fit the bill.
If you mean guys who needed time in the G League specifically, then guys like Danny Green, Dejounte Murray and even Derrick White (was a matured aged draftee, but had come from a veeeery long way back through his college journey, and then still needed basically a full year in Austin to become an NBA level role player.
Looking elsewhere, I would point to Jermaine O’Neal as the most obvious example. This was pre G-league, and was drafted as a high schooler, but basically spent 4 years in Portland doing absolutely nothing. Before very quickly becoming an All-NBA and perennial All Star in Indy.