Their safeties include a first-team All Pro (McKinney). Somehow their "nothing to worry about" roster managed to 6th (points) / 5th (yards) last season. Seems to me that upgrading from a good DT to a generational EDGE could make them pretty worrisome.
Seems they were doing pretty well without having to spend $47m on Parsons. Of course, they lost several starters since last year including Stokes and Alexander and their starting nose tackle TJ Slaton and of course, Kenny Clark. Parson's is great, I think they defense outside Parsons is worse.