Interesting career that Byrnes had. He was terrific in 2009 and 2010 and the rest of his career was underwhelming, to say the least. He was in the right place at the right time in 2007, but was an absolute walk up in the 2009 side. I wouldn't have thought he was the worst two time premiership player though.
I can't include Byrnes in this list purely because his 2009 and 2010 were very good. He was anything but a spud then.