DerMarr Johnson is probably the most overlooked Spur. His skillset is pretty damn similar to Stephen Jackson. He's even taller and even longer ... which is nice with the giant azz Lakers now seemingly the team to beat.
I hope Johnson plays in summer league and shows he's continuing to work on his game. He's 28 and he's been given up on a number of times so he's probably in a good frame of mind in terms of doing whatever the Spurs want.
If he plays well in summer league, he should definitely go to training camp and be given a legit shot. A long, athletic perimeter player who can shoot isn't something you come across everyday. I know he's damaged goods and not too much of an exciting prospect at this point, but you never know when a guy will figure it all out like Stephen Jackson in '03.