Tatum is second in the entire NBA in Post Up PPP at 1.29 (among qualified players), he’s also tied for 58th out of the top 60 in frequency. Which means that he’s an elite post player that rarely posts up relative to his peers.
It’s tough to double team him on post ups because opponents have to leave their assignment before the catch (leaving them wide open) or risk being too late (and be left in no man’s land). Without the double, he gets to the rim and is either fouled or they take the chance of him taking a point blank layup.
With the amount of double teams the Jazz used and zone defense they played, it was a great game to post JT up often. Horford, Muscala, and Hauser, specifically, are elite spot up shooters (while the entire team is solid in that department) and the team is full of players that are particularly good in several play types.
Running Jayson with momentum into a set defense with awaiting defenders clogging driving lanes like he’s Lebron is asinine. Spread out the shooters, get him the ball in the post, and let him go to work.
The stats aren’t a secret; anyone can find who does well in certain situations. Mazzulla has to lean into his best players strengths and put them in a better position to win.