super stars cannot teach others because if they could they would all be coaching. Check his record first with the Dodgers and then the Marlins and especially the Marlins - they were brutal. It's also a different game vs when he played; with pitchers routinely hitting triple digits
launch angle is just the result not the swing, it's a thing and has little to do with what you call "upper cut". Watch Walker and Moreno swing or next season tune in to Dodger games - they lead the league (or near the top) in launch angle - it's no accident.
it just got me thinking, many factors actually - playing time, confidence he's batting 3rd!!, and of course the overall hitting problems that have impacted almost every player