2.) Graham, Branham, Sohan, McDermott, and Bassey
If Popovich decides to bring Sochan off the bench, he'll hopefully give him more opportunity to play with the ball in his hands. Having Sochan run point forward would mean that they would need shooting around him as well as a roll man who can draw attention. Thus, Graham, Malaki Branham, McDermott, and Charles Bassey would be a good combination to try.
Graham is the team's best shooter at point guard, while McDermott is the best shooter on the team. As for Branham, he shot just 30.9% from three last season but he's a better shooter than he's shown thus far. He'll likely also spend more time on the ball after getting experience doing so last season. Ballhandling, playmaking, and shooting could make this a good offensive lineup, but aside from Bassey's rim protection and Sochan's versatility, they probably won't be a good defensive unit.
Still, the Spurs have a history of skewing more toward offense in their second unit and if Branham and Sochan are able to expand their games, then this 5-man grouping could be surprisingly potent. That is if Pop gives this lineup a try.