If the insider goss is to be believed then Brendan's unwillingness to travel to Bristol for a few hours training is as much to be blamed as Sunetra's schedule. Who knows?
Following on from the literary bent of the Steve Backshall thread, I do get the impression that every summer the casts of Eastenders, Casualty, Holby City and Waterloo Road are gathered together in a reenactment of Shirley Jackson's The Lottery with the chosen one doomed for Strictly. It may even come under the publicity and promotions section of their contract.
It is part of the unfairness of Strictly; some contestants are dance-trained, some have performance skills, some are athletic, some are young and some have the time to train. You get people like Mark Wright, Abby or Fiona who don't have a lot going on and then you get people like Sunetra, Matt Baker or Tim who are still doing the day job.