Lineup #2: Bryn Forbes, Devin Vassell, Keldon Johnson, Doug McDermott, Jakob Poeltl
The aim of this lineup is simple: maximize driving lanes for Keldon Johnson without sacrificing too much on the other end of the floor.
Floor spacing shouldn't be an issue here. Between McDermott and Forbes, this lineup fields two players who have career three-point shooting percentages over 40 percent. Add in Devin Vassell and his 35 percent rate from downtown and there should be little to no fear of defenses packing the lane to prevent Keldon from doing what he does best.
The San Antonio Spurs were determined to attack the rim at every opportunity last season. As a team, they averaged nearly 56 drives per game, good enough to be second in the league in that particular metric. And a lot of that came from the newest Chicago Bull, DeMar DeRozan. If the Spurs want to maintain a similar style of play to the one they did last season, then Keldon seems like one of the most obvious candidates to fill the hole left by DeRozan's departure.
Johnson averaged 0.74 points per drive last season - higher than many of the players most fans identify as some of the most dangerous in the league when they're attacking the rim. He had a higher point per drive figure than DeMar, James Harden, Ja Morant, Devin Booker, and Shai Gilgeous-Alexander.
Now, those players did end up creating more points for their respective teams with their ability to create assists out of those drives - an area where Johnson still needs to significantly improve - but the point remains that the Spurs would be wise to maximize Keldon's opportunities to get downhill and attack the cup.
One potential flaw with this lineup would be the lack of playmaking. Outside of Forbes, who started at point guard for the Spurs for a good chunk of the '18-19 season, no one in this lineup has any real experience in running an NBA offense. Although that'll certainly be a drawback, getting players such as Johnson and Vassell more experience with the ball in their hands could also help the Spurs in the long run.