Once again Griezmann won't change as a player, he'll play exactly the same way he did at Barcelona. The difference will be that Atletico's style of play will suit him as he won't have to carry the ball, dribble past opponents, constantly create, and provide width when necessary; defending, off the ball movement, link up play, and getting at the end of chances will be enough for him to excel there.
It's weird to see people rationalize that he was in bad form. He's just a poor, poor fit for us. End of.