These are two of the most likely candidates to join the Bucks on June 21 and both guys would fill a nice need for Milwaukee off the bench.
Keita Bates-Diop would be an excellent replacement for Parker if he leaves in free agency. Although Bates-Diop isn’t nearly as athletic, he can shoot the ball better and is a good rebounder as well. He might not have a position in the NBA, but if he can find one, he’d create an interesting fit alongside Antetokounmpo in a small ball lineup.
Lonnie Walker is more of a shoot-first guard who could provide the scoring burst off the bench Milwaukee lacks at times. Unlike Bates-Diop who was a four-year player at Ohio State, Walker only played one season and has a lot of growth remaining. That upside could intrigue the Bucks to move him ahead of Bates-Diop.