There are a lot of Saints fans who don't know much about football that say a lot of dumb things like "he's regressed omg!" after they watched him put up generational, unsustainable stats his rookie year and "regressed" from an 8-10 game stretch of "the best defensive player to ever play football" type numbers to "top 2-3 CB in the league" type numbers.
You, and they, will just need to watch more football. He is one of the best, if not the best CB in football. We can revisit this again when he's a free agent, if you'd like to be wrong even more.