>>105518642Because Greg's a decent guy. And because historically he's the only human to actually get liked by any of the diamonds.
Pink fell in love with him so hard she was willing to die to have his child.
Blue spoke with him for less than 5 minutes and she decided she would rather he live on in the human zoo than die when the cluster erupts from earth. What could have happened if he had an hour to work the old Universe charm?