Buster Posey has seen this before.When Rafael Devers refused to leave for a pinch runner in the ninth inning of Sunday’s loss to the Miami Marlins, returning to the dugout visibly upset, it was easy to read the moment as a sign of a clubhouse fracturing under the weight of an underwhelming season.Posey read it differently.“You could tell he’s frustrated,” Posey told reporters before Tuesday’s game against the Athletics. “The way the season’s gone, everybody’s frustrated, and I think that’s a byproduct of frustration. I haven’t spoken to Rafi directly, but I know Tony has talked to him, and I know they had a good conversation after the game.”Then Posey reached back a decade for context.“It kind of reminded me — it’s not exactly the same — but I remember an incident with [Santiago] Casilla in Arizona one time, coming off the mound with Boch,” Posey said. “Sometimes in the heat of the moment you’re battling, you want to win a game so bad, stuff comes out and happens probably that you would rather it not happen. I think about Casilla as one of my favorite people in...