Sunderland still manage a full house, they even had over 28,000 at home to Gillingham on a shhite Tuesday night in February, so that defeats your argument slightly.
I could do a @CFC: Champions of FFP x2 and selectively pluck out some low attendances too if it’s a topic you want to dig into a bit.
Yes they’re a big club just as most one-club cities are. Well done them.
http://european-football-statistics.co.uk/attnclub/league/sund.htm
