The prospect of Jayson Tatum returning this season from the Achilles rupture that has sidelined him since last 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). Brian Robb of MassLive writes that on a recent podcast, Tatum had discussed the Celtics’ success without him this season, and 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 a worry that his presence could change the dynamic of the team. “It is a thought like, ‘Damn, do I come back?