Good question... I know there has been Co-MVPs for all-star game (Malone and Stockton).
Honestly, Shaq isn't playing all that great right now. He is slower and he hits only 48% on the foul line and he is not the go-to guy in the 4th quarter when the game is tight. Wade is.
If people want to say the reason Nash is good because of our line-up (well, he is a PG anyway!), then this goes the same to Shaq and Wade. Wade has improved A LOT. Shaq doesn't benefit from Wade's mvp stats?