Jaxson Dart: I've tried to model my game after Jalen Hurts.

I don't know why you think they are so committed to him that they would not draft another QB. We already know that they really like Ward and have talked to the Titans about the cost for trading up to take Ward. That price was too high, but it's pretty clear they are not out of the QB market just because they think Rattler has some potential. They also like Sanders, but they think he has a late first or 2nd round grade.

As far as history, they drafted Haener 2 years after they drafted Book and they drafted Rattler the year after they drafted Haener. So they seem to be drafting QBs pretty regularly in the last 3 or 4 years. That's 3 QBs drafted in 4 years.
Rattler was considered really good value by many in the business. Not just by the Saints, but by many people outside the organization. Haener and Book were never considered value picks. Rattler isn’t like any other QB that the Saints drafted in the past 10yrs including Garrett Grayson, who I think they also believed in as well. They gave Grayson many years until they finally gave up on him and I believe they will take a similar route with Rattler.