Jenkins from what I understand played at his best in the box...covering the slot and playing SS. CGJ is actually VERY similar to Jenkins, though I think that CGJ is a more violent/physical player. Jenkins should be a tremendous mentor for CGJ.
Saints main defense the past few seasons has been nickel or 4-2. I’m pretty confident that you see Jenkins and CGJ on the field a ton this season. PRob will likely go on the field in dime and heavy 3-WR sets. Gives the Saints some ability to play matchups and mix up their formations. I still think that another LB is essential, especially one capable in zone coverage. Anzalone has potential but has been incredibly inconsistent and you just can’t depend on him with injuries. Kiko is a nice downhill run defender but he’s a bit limited in coverage (along with concerns about injury).
Jenkins is on a two year deal. It wouldn’t surprise me if the Saints draft a CB but I probably wouldn’t in the 1st. I’d say it’s pretty likely that incoming CB from any round would play much this season.