That's true -- at that time (late 80's) San Antonio had several really good young basketball players around. There were the John Jay guys (including Calvin Thomas and Bo Outlaw), the East Central guys (led by Tony Terrell and Robert Keno) and a handful of other players here and there (Artie Griffin at Lee, Ski Jones at Marshall). Shaq was a part of that, but I think because he played in 2A and not in 5A, he probably was more of an after-thought in some people's minds. Obviously, not the way it should have been, but I think that might be the reason he wasn't the center of the SA hoops world at that point.
San Antonio was able, in the summer of '89, to put together a junior olympics team that beat a similar team from Bloomington, Indiana. The Bloomington team included Calbert Cheaney and Lawrence Funderburke, among others.