Very true, but Olynyk's scoring was always an underrated side of his game anyway. He had his quirks, but Kelly was great at finding unlikely ways of putting the ball in the basket under pressure. Most of that is stuff you can't teach.
Flip's best NBA attribute, by far, is his passing. He's an intuitive facilitator, like Jokic. It's a different type of skill than scoring - a scorer needs to avoid defensive attention, whereas a passer needs it and uses it. Turning himself into enough of a threat is what will make or break Flip.