breshard perriman, dj chark (so far), the brockers trade, the trinity benson trade. failures.
the anzalone and raymond re-signings are questionable as well. failing to upgrade linebacker has hurt them.
i would add that the "getting the whole gang back together" offseason strategy from a 3-13-1 team and expecting different results has not been successful so far either. especially on defense.
but again, this all must be taken in full context.
1) they are still rebuilding and still dont have the biggest piece of all: a qb;
2) it doesnt make a lot of sense to bring in big time free agent players if you dont expect to contend;
3) they are devastated by injuries to multiple key players on offense and defense.