I did not realise that he was a last minute replacement for another judge and was suggested by Erin Boag.
He was certainly a big part of Strictly and was a great fit for the show, especially in the early days. Later on he seemed to get more grumpy and a bit meaner so I wasn't disappointed when he cut back to just the American gig. Saying this, I do think that the head judge role is tougher and held to a higher standard by the viewers than the others, as Shirley has found out at times.