He'll likely not be a top 3 qb off the board. At the end of the day, i'm not totally sure why. He's a more ready NFL player than the others. HE throws a very very very solid ball with very good enough arm talent. He's shown to me to be very accurate with his passes. (I think accuracy is the biggest need of a qb with a WR1 named Michael Thomas) He's a heck of an athlete, can be mobile in today's game. On thinner side, but has nfl height and proved to be a winner in college.
For the Saints, transitioning to a defensive minded ball club, need a steady presence on the cheap would be terrific getting this team out of cap hell (yes it is a thing for all you non believers). I would not be against Saints drafting a player at 18 but trying to fight there way back to the bottom of the 1st or top of the 2nd to go after Desmond Ridder. I believe he's a great fit here.