One concerning thing about Frank Jackson is that he is a 2-foot jumper. For a dude having a 42 inch vertical, you'd think you'd be able to find more highlights of him dunking, but you really can't. Every time he dunks (from what I've seen) it's off two feet. He doesnt get much elevation off 1 foot in traffic. It's a pretty stark contrast to Grayson Allen, who can really explode off 1 foot in traffic.
He doesn't need to dunk everything. See if he makes lay-ups off one foot.