Getty Boston Celtics forward Jayson Tatum reacts. (Photo by Kevin C. Cox/Getty Images) As optimism builds around Jayson Tatum ’s recovery, a detailed breakdown from Celtics analyst Keith Smith of Spotrac  has provided the clearest picture yet of what still lies ahead — and why Boston remains cautious despite a significant step forward. Smith outlined the reality behind Tatum’s latest rehab milestone after reports surfaced that the Celtics star has progressed to controlled five-on-five