Let's forgot about Irving for a second. I'd like to look at last years group (post Irving injury) and try to project their success in this years NBA. Too many people are using the Conference Finals run as the basis for their argument. My problem is that the Celtics offensive shortcomings would have killed them in this years NBA. Do people really believe that last years team could beat Milwaukee, Toronto, or even Philly? The competition has gotten much stronger.
We also can't ignore the impact of the underdog role. Even without Irving, the Celtics wouldn't have been underdogs after last seasons playoff run. Toronto, Philly, and Milwaukee had plenty of doubters prior to the start of this season.