And 6th is relative to 5th in my mind. Regiment got 2nd in brass in 08, i'd hardly call them a problem section. Regiment got 4th in GE music this year... the brass performance does have a hand in that as well. I would hardly call them a "trouble" section.
However you want to chop it, PR has been 6th in horns the last 3 years. I think the hornlines from the last three years have been comparable, as can be witnessed in their placements. The biggest drop off I've seen was between 08-09, not between 10-11.
Something else happened between 08-09 with PR brass... if you get my drift...