San Antonio Spurs Trade Piece 1: Lonnie Walker IV
My feelings about Lonnie Walker IV as both a player and a person should be decently well-known by now. While he's definitely one of the rawest players on the current Spurs roster and has several areas of his game he can improve upon, he may also have the highest ceiling of the Spurs young players if he's able to put it all together. It's worth keeping in mind that this was his first season with very regular minutes on the floor.
This is where Walker's value comes from. While it isn't necessarily guaranteed that he becomes a very good player in the future, he has enough tools already present that could make him worthy of a gamble by the Sixers.
For these same reasons, I would be very hesitant about letting go of Walker if I were the Spurs front office, even for a proven defender like Simmons. The kind of athleticism and shooting upside that Walker possesses doesn't exactly grow on trees.
On the other hand, if the Spurs don't see a future in which Walker grows into a valuable piece of the team, shelling him out to the Sixers to gamble on a player like Simmons wouldn't necessarily be a bad idea. The swap would immediately provide the Spurs with an upgrade on defense, and if the coaching staff is able to unlock Simmons' offense, the move could be a game-changer.
Ultimately though, I am still a bit uncomfortable with giving up Walker (assumingly with other assets) for Simmons. Walker is still only 22 years old, obviously knows the Spurs system better than Simmons, and could still make some serious improvements to his game, particularly on offense.