Replacement #2: Johnny Davis
Davis was one of the best scorers in college basketball last season, averaging 19.7 points per game, and did so without relying on threes. In fact, more than 75% of his shot attempts came inside the arc, where he connected on a solid 46.6% of his twos.
While Davis isn't an incredible athlete, he has a knack for getting into the paint and makes great use of hesitation dribbles to keep his defender guessing. Moreover, he's an aggressive and opportunistic driver and is surprisingly fast in attacking the basket. He can also score effectively in the midrange and projects to be at least a decent 3-point shooter in the NBA.
Defensively, he does a great job of keeping his man in front of him, relying on his lateral speed and length to force tough shots. That impact didn't necessarily show up in his stats, but he shouldn't have any problem defending his position in the NBA.
On the Spurs, Davis would add a more effective scorer to the team's second unit and has shown promising playmaking ability, which should allow him to fill Walker's role.