Calvin has the type of swing of a guy who still splits his workouts in to back/biceps, trains rear delts, and sometimes just "arms".
He is trying to become more athletic and key on hip rotation, fast twitch muscles, wrist/leg alignment, etc.....
He is struggling to let go of his old school ways, but he is trying. We must continue to support him. He is finally not wearing his weigh belt on the field, so it's a start.
Something like this