The prospect of Jayson Tatum returning this season from the Achilles rupture that has sidelined him since last spring’s playoffs grew murkier on Wednesday night, as NBA insider Chris Haynes reported that Tatum is reevaluating the idea and considering sitting out the rest of the Celtics‘ season (Twitter video link). While it appeared Tatum was getting closer to being able to make his anticipated season debut, Haynes says the star wing’s return is now considered “up in the air.”According to Haynes, Tatum previously told him that he had planned on coming back this season, but league sources say the situation has changed for “a couple” reasons, though Haynes didn’t elaborate on what those reasons were. As Brian Robb of MassLive writes, in a recent podcast appearance, Tatum discussed the Celtics’ success without him this season and addressed how that delicate chemistry could impact his decision to suit up this year. “They have an identity this year or things that they felt has clicked for them and has been successful,” Tatum said. Tatum expressed some concern that his presence could change the dynamic of the team.