Steve Kerr will not pull the trigger unless he gets quality players like KG or Perk + Powe. Steve thinks Shaq is a sine qua non piece of the Suns for a title run this year or next year. He knows too well that to get to the Finals his team must go through either LAL or the Spurs (a team which he played alongside Duncan). With Shaq in his lineup, he gets somebody who takes either team (Kobe for LA and Duncan for the Spurs) personally. Those are personalities/players who can handle a team and lead it farther than anyone can imagine. In short, with Shaq in his roster, he's got somebody who is more motivated than any player in the West.