I mean, I've suspected it was Obito for ages, but seeing him *actually* standing right next to Madara on the battlefield? That was still a gut punch, a whole new level of messed up I wasn't quite ready for. The flashback to him waking up, totally vulnerable in that cave, just solidified my belief that Madara played him like a fiddle from the start. And man, my heart absolutely broke for Tsunade, getting torn in half like that felt incredibly savage and undeserved.