I did not say he was the least productive offensive player.

Actually I have stated more than once I believe that he was the MVP of the team.

What the numbers do state unequivocally is that he was the least efficient offensive player, if you define least efficient as:
For the player who ultimately ended a possession - how many points were generated from that possession. It is merely an individual extension of the team metric of points per possession.

KC is/was a great player - the team fell apart when he wasn't on the floor because he was a great enabler.
I believe that he should NOT have been the number one consumer of possessions though and the numbers support that. His points per possession numbers were historically low for a player who was the primary offensive option. A team cannot win big games if they only get 0.8 points per possession as a team. Good teams must be in the high 0.95+ range. Tournament teams need to be >1.0. When KC was giving the ball to Emery, Davis, Seljaas, Fischer, we were producing in the tournament level production. When he was ending the possession, we were producing at the bottom of the WCC level. Generally that means he was forcing it - either with poor shots, or forced passes, etc. He was great at distributing, and running the team - he needed to do more of that, and less trying to take over the game - his shooting percentage and esp his FT shooting percentage simply weren't good enough to allow him to be a primary offensive option.