I don't know if it's just me looking too much into it, but it seems like Jaylen's poor finishing at the rim has during SL has something to do with him tweaking the way he finishes. I watched some of his highlights from Cal and he tends to use his off hand to brush off defenders while finishing. He hasn't done that as much in the SL. I wonder if someone told him that it wasn't going to fly in the NBA and decided to change it.
Of course, I am comparing it to highlights from college, so maybe that is his main way of finishing.