Never cared for Bradley, always loved Quinn. I'm sure Bradley did some things very well, things that are beyond my comprehension. But man, that guy loved zone defense, no matter his situation or personnel. I think the balance between Man and Zone usage has been far more reasonable this season. He was also loathe to blitz, back when we had Clemons and pretty much nothing else. And when an injured Bryant was KILLING us at DE last season, he watched and did nothing. I just don't get where the love for him came from. When people in the media tried to hype him and give specifics, the only things I'd ever hear was that he is a great speaker and Monte Kiffin liked him a lot.
By contrast, Quinn helped handpick Michael Bennett in UDFA his first season here, schemed street free agent Raheem Brock into a career year at age 32, was perhaps instrumental in Clemons' massive career turnaround, turned Red Bryant into a useful role player, and presumably played a part in Seattle's multitude of DL acquisitions this offseason, all of which have been terrific additions. He hasn't biltzed as much as I thought he would, but he hasn't really needed to. Four and Five man rushes are statistically the best to use, and that's his bread and butter. Even when we rush four, it's like a blitz because there is so much movement (stunting, etc) on the play.
And after years of being middle of the pack vs the run, our run defense looks pretty impressive so far this year, especially when you filter out QB rushing yards.
I wouldn't go so far as to rate Quinn among the best DCs or Bradley among the worst. Really, I'm not an expert and I can only judge based on limited information. But I felt from day one that losing Bradley would probably help us, and when I heard Quinn would replace him, that confidence increased several times over. I do think that Quinn, so far, is a clear upgrade at DC, based only on the methods he's used and the results he's achieved. There a lot i don't know, but it doesn't really feel like a close call, IMO.