This situation is extremely bizarre and there is no clear explanation. With that said, if you ask me the most likely one is this: Fultz started feeling discomfort in his shoulder and brought it to the attention to the Sixers' medical staff. The Sixers then told him nothing was structurally wrong, and that they expected him to play. So Fultz and his agent relented, even as he didn't feel physically right, but that he would change his form and not attempt any jumpshots as a way to shine the light on the organization and cast it, rather than Fultz, as the stubborn party. If that was in fact the strategy then it worked, given the media attention on the situation and the fact that people are now talking once again about Sixers' history of mis-managing injuries.