Problem with buyouts is that the Spurs aren't trading away rotation players to get them. If the issue is that Tony and Manu aren't good enough to be lead guards, then bringing in more guards by itself won't help too much. Meeks is probably the best player on that list when healthy (well Williams is, but no), and he'd compete with Simmons for playing time while Manu continue to get guaranteed minutes for mixed-bag play.