He doesn't have to be a generation talent to be worth it at #9. The Saints have failed at O-line and D-line first round draft picks, and I don't have any faith that that trend will change. It's been an ongoing theme for a long time. If Jeanty can have an Ingram or Kamara like career, that will be pretty good value. They will go from being good at nothing to being pretty good in the run game.
I could be wrong, and I often am, but I think Jeanty could have a bigger impact than anyone else they pick at 9, even if he's not BPA. But there are plenty of holes everywhere so not picking Jeanty at 9 wouldn't be the worst decision, either.