What if Steve Nash played out his career in Dallas? After six successful seasons with the Dallas Mavericks, in 2004 Steve Nash left for the Phoenix Suns. His tenure in Dallas included two All-Star Game appearances and being named to the All-NBA team twice. The Mavericks made the Western Conference Finals in 2003 with Nash leading their offense. Mark Cuban declined to offer Nash a new contract due to concerns about his health going into his thirties. “I’m really sad to leave my teammates, but I’m glad to be going somewhere where they really wanted me,” Nash said at the…