Ok I'm going to go one step further and build a whole team (without duplicating any of the players).
PG - Magic and Jerry West: using Magic's size and passing, with West's scoring, range, defense, and clutch.
SG - Jordan and Ray Allen: basically all of Jordan's game, with Ray Allen's outside shot and free throw shooting.
SF - LeBron and Bill Russell: Built around LeBron's game, with Bill Russell's heart, class, team first mentality, defense, and rebounding. A little weak on the outside shot and free throws for my superstar team though.
PF - Wilt and Dirk: Built around Wilt's frame and overall game but adding in Dirk's shooting.
C - Shaq and Bird: Built around Shaq's frame, prime athleticism and power, with Bird's outside shot, passing, and free throw shooting.
-edit, looks like my Magic/West point guard wouldn't qualify under Roy's rules because there's a 6" height difference. Hmmm, need to think about this some more.