Actually, we wouldn't be having this discussion if our defense didn't get gashed for so many points. Browner is much better shoving people around the line, messing up the timing of the early routes, Thurmond, not so much. You have to pick your poison with the two. Browner supports our rush much better but if they don't get there, he can't maintain that coverage indefinitely. That is true for a lot of defensive backs, not just Browner.
Schematically, I'll take our kick ass, punch you in the mouth approach and the risks associated. Even with Browner's "deficiencies", Luck had to make perfect throws on a number of occasions to beat us. Perfect throws beat coverage every time. If we fix just one or two things that we did wrong in this game we'll still have a hell of a season.
I look forward to the revenge of the Legion of Boom.