Im not sure he goes down as the greatest ever.
He is certainly in the arguement though.
Wilt, Russell, Kareem and Hakeem all have legit cases over him. Hakeem won "more" with less, by that he won his titles in a much stronger league. Kareem has longevity on his side, was dominant, has it all really. Wilt is the most amazing statistically, Russell just flat out won. I think Shaq is in that group. It doesnt really matter what he does from here, win or lose, 6 trips to the finals is pretty incredible always as the best player. Cant really argue against that :)