There is a strong possibility they don't sign any of these guys. If the Spurs are not crazy about the potential of a 15th guy, they won't sign them.
Spurs history notes that their roster isn't always the same from Oct to April.
1) Spurs get at least 1 trade talk / deal a year, whether that goes through or not depends.(like Stephen Jackson)
2) The Spurs always scouer the waiver wire post trade dead line to find someone to help. (like Boris Diaw and Patty Mills)
Will it be 2005 Nazr Mohammed helping us win the title? or 2008 Kurt Thomas looking menacingly at the Phoenix Suns? Who knows, point being the Spurs are never really done adding and subtracting to their roster.