I think the more important question for the Spurs is to whether or not to move from the Demar-Lamarcus veteran core. If Demar declines his option and becomes a free agent, then there is a domino effect from there ..if not, then the Spurs must think of trading Aldridge for a rebounding PF or a long SF and retain Poeltl. While Aldridge is really good at what he does, he doesn't fit the guard centric roster we have and is not the guy to have during a youth movement as well.
Demar has proved that he can gel well with the younger lot and allows them to grow. Aldridge has expanded his game but he is also too old now and too slow to defend at the perimeter.
Poeltl is valuable as a rim protecting, screen setting, pick and roll big. He needs to add some more polish to his finishing and he will max out as a Tyson Chandler. Eubanks can back him up.