Interesting take. Boston was a -5 1/2 favorite on the road with Tatum. If you think his minutes are over 8 points better than his replacements than the chalk should be a good bet.
FWIW, the Celtics made a big defensive adjustment between games 4 and 5. After getting burned by Mikhal Bridges in game 4 Joe Mazzulla had a defender glued to him at all times. The plan worked. If Tom Thibodeau doesn't come up with a counter the Knicks are likely in trouble, but if they can find a way to score with Bridges' defender stuck on the weak side and unable to help then this could be a blowout win for NY. Just my opinion... GL Donnie.