This is a really tough one for me for so many different reasons. Dantley and King were a bit before my time. I remember King from the end of his career, and I don't remember much about Dantley.
Grant Hill, in my opinion, was the 2nd best player in the league his first few years. People forget how amazing of a player he was. If I remember correctly, he averaged pretty damn close to 22 points, 8 rebound, and 6 assists in his Detroit days. Had he been smart enough to NOT play hurt his last year in Detroit, I am convinced he would have been in top-20 of all time conversations. He was a Lebron before Lebron. Having said all that, it is REALLY hard to base my vote on 6 years.
I'd have to say Wilkins if we are looking at entire careers, and Hill if 6 year sample is enough.