Now that Alex Brown is a Saint (a very good move), the Saints seem to have decent depth at DE for now. I'm going to ignore offense because, let's be honest, as it is right now the Saints have one of the most complete and dangerous offenses in the NFL. So, what position should the Saints target next?
If DE is set, then that leaves DT, LB, CB, FS, and SS, but the safeties and cornerbacks were great last year, when injuries were avoided. That leaves LB and DT. Vilma is a great MLB, Shanle is a solid OLB, and then there's a whole bunch of backups available for strong LB. Big Sed has one of the DT spots on lockdown, and Hargrove is a good pass-rushing DT. So either an upgrade over the backups for strong LB (or over Arnoux), an upgrade over Shanle, or a DT upgrade over Hargrove et al. I'm assuming that the Saints will wait a year to let Jenkins develop before spending another draft pick on a CB to shore up depth there, but I think that's a pretty solid assumption.
At first, I thought that maybe we should get a LB because we lost Fujita and Shanle isn't a record-smasher. However, after consideration, I think that DT would be a better pick, all other things equal. I reasoned this way because we have a greater depth of more competent LB than we do at DT. No one has seen Arnoux outside of the Saints building, but if you consider him and the rest of the backup LBs, there seems to be a decent amount of depth to fill one spot. DT, on the other hand, has been mostly filled with older vets that the Saints snagged for cheap. If the Saints picked a good DT, it would allow the defense to stop the run better and, more importantly, blitz better. I'm not sure if anyone really noticed, but the Saints defense was mostly ineffective at blitzing up the middle. Of course, good LBs are necessary for good blitzing, but I believe that LBs already have the upperhand in blitzes and thus a mediocre LB can still bring a good blitz. Anyway, it seems like the ineffective middle blitz might have been due to the DT inability to eat up enough blockers, but in any case, a blitz in the middle of the line disrupts the QB more than any other blitz simply because it is much harder to move laterally to escape and there's no moving up in the pocket. I think a good DT helps create this more than a good LB, all else considered equal.
While I do think that DT would be a better pick, I can still see a LB pick (note: I'm hedging my bet here). The one reason I could come up with is that GW loves flexibility, and if he wants to flip into a 3-4 from a 4-3, he needs more quality LBs to do it. Right now, I would not be confident with our best four LBs on the field at the same time; one weakish spot can be covered, but two can be exploited.