I remember Vaughn went on a pretty big hot streak in 2021 when he steadied his hands more during his load. It sapped some exit velocity, but he was hitting the ball hard more consistently. I don't think Vaughn's problem was that he didn't hit for enough power, it was that his approach never improved. If he improves his approach, the power will come eventually when you start swinging at better pitches. Just another example of poor development by the Sox.