This has been on my mind for at least a month now, and I need to present what I see. Before quickly discarding what I am broaching, please note that I spent years as a Research Engineer, a profession where precise measurements drive results. My point is, Jayson Tatum seems to have gained some height.
Here is my exhibit. Take a look at the starting-five for Boston. Now at first glance, it looks like Jayson is the tallest of the group, even taller than Al Horford - who is listed at 6'10".