2. Harrison Barnes
Yes, I know Keldon Johnson is on the roster, and Malaki Branham is showing potential, but hear me out. Harrison Barnes averages 15.1 points, 4.7 rebounds, and 1.6 assists per game as a starter for the Sacramento Kings, but he turns 31 in May, so suggesting a bench role for him isn't outrageous. Barnes can play the three or four, giving Head Coach Gregg Popovich more lineup flexibility. Factor in that signing Barnes would be adding another piece with championship experience, and his presence will only help the young guys develop winning habits while being a solid contributor.
3. Draymond Green (Player Option)
This one might shock fans, but Draymond Green is a Swiss Army knife that can provide plenty of value to the Spurs. A former Defensive Player of the Year and seven-time All-Defensive Team member, Green could help take the Spurs' defense to new heights, but his impact doesn't stop there. The four-time NBA champion is a strong facilitator and as intelligent of a player as there is in the modern era. Adding Green would be like having a coach on the floor, and that addition would only continue to foster growth for the rest of the players. Getting him to San Antonio would be a tough sell, but no state income tax would lessen the blow. He would have to opt out of the $27.6M on the final year of his contract, and if he expects more money from the Spurs, it's unlikely they would pay that price for the 33-year-old forward.