With Keith Butler’s retirement official, and with it coming from his own mouth, unlikely to be rescinded within the next week like several other Steeler coaches “retirements”, it is a good time to take stock of what his run as defensive coordinator looked like.
In 2015 when Butler took over for Dick LeBeau there was a significant amount of change on the defensive roster. Troy Polamalu, Ike Taylor and Brett Keisel all retired, they had started a total of 26 seasons combined for the Steelers, all of them on the roster for more than a decade.