I believe they have to, and I think Stevens is planning this as well. He's probably fine rolling with a group of Porzingis-Horford-Gabriel-Kornet in the frontcourt (maybe Griffin if he doesn't retire) for the 1st half of the season, then depending on injuries or how it looks for the team, he'll probably add a depth big at the deadline or buyout market. They can survive the regular season even with limited frontcourt depth, what matters most is April and beyond