Last time this was posted (on the old comm) I speculated that it's because the way the Li'l Leaguers look comes from Superman's mind, and, as much as he respects Wally - as much as he LIKES Wally - to him, 'the Flash' is, by default, the one he met first, the one he was on a team with for several years before Wally ever took the red costume - to him, 'the Flash' is Barry.