I don't know about them pulling up on big hits. If Stiner had a big hit last year I sure don't remember it. Taylor is functional versus the run and making tackles.... though certainly not a big hitter. Stiner is just as bad vs the run as he is vs the pass. I really can't think of a strong point for him. Maybe disguising blitzes? He had a few big play blitzes but they were mostly running free not beating a blocker.
I still haven't see O&B game still. If those guys aren't significantly better than they were last year we're still going to have a mediocre-at-best defense. You cant be bad at both safety positions and be anything better than mediocre.
As for linebacker big Reese isn't great in coverage, he is slow, but at least he tries. I think whoever replaces Vosean is going to be much better in coverage, especially if it is Burney. Vosean was a blitz specialist who missed his hole more often than not in run support and was laughable in coverage, which was always baffling to me given that he was undersized and fast.