I agree that when you are going to get drafted high, it makes sense to go and secure your future. However, the gap between the first couple of picks and the rest gets wider every year. For example the difference between being the first pick this year (~$52M over 4 years) and being the 7th pick this year (~$28M over 4 years) is the same gap between being the 7th pick and an early second round pick. Every slot at the top of the draft makes a big difference. In the teens and 20s it stops making a big difference.
All that is to say, going back to school to be one of the top 1 or 2 picks vs. the 6th or 7th pick actually could make financial sense if you get a large NIL deal to go back. Plus you enter the league that much more physically ready to compete and make an impact - there are plenty of lottery picks that went after their freshman year, drafted on potential and flame out and never get that big money contract, because they went to the wrong team, weren't used correctly, not allowed to develop etc.
I'm not saying that will be Keaton, we all think he's going to make it, but it's something to consider and he and his family seem to be thinking about this the right way, what is best for Keaton and his future. I don't think there is a wrong decision for him, I think either path leads to greatness for him.