Some Celtics fans will not want to hear this, but Isaiah Thomas, who was waived by the Clippers, is not an option. Evan Turner, who is expected to have his contract bought out by the Timberwolves, struggled in limited minutes for Atlanta this year. But he could be a good break-glass-in-case-of-emergency possibility for the Celtics if there are multiple injuries during the playoffs, because he has shown he can play well in Stevens’s system.