@PermanentTemporary Yes, the students in the squad are in a culture that encourages complete compliance to the squad culture and rules, under fear of getting binned. You cannot expect them to do anything other than follow the lead of the coaches and submit to what they are told to do.
While I don't think the young man should have put himself in that position, he will have been encouraged to trial by others and allowed to think that he had the right to be there.
None of those young adults should find themselves under media scrutiny for things they were led to do by others who should have known better.
It would be primarily the CUW/CUBC coaching and support team who allowed him to trial and selected him.
Also, assuming he probably rowed for his college women's crew beforehand, any fellows/officers at the college who allowed and encouraged this, or encouraged him to trial, or celebrated his selection for the uni squad.
Also The Boat Race company (I think it had switched to them rather than the henley races org this year). Did their rules at the time allow self ID for crews? Or if not did they know and decide not to do anything about it? I've seen it said that for this year they didn't print the crews schools in the programme as the young man attended a boys school. If thats true then someone knew and wanted to not bring attention to it.
There was a lot going on this year. 2015 was the first year the women's race was internationally televised for the first time bringing an unprecedented level of coverage for the women's squad and race. The squads had had to get used to a change from a 2km race at Henley to a 4.2 mile race on the tideway. Did the focus on this big first (and equality with the mens race) make an embarrassing secret easier to hide? Did it drive the decision to stick him in Blondie, who raced the day before and had no TV coverage? I cant imagine it wasn't the subject of considerable concern within the Cambridge coaching team.
Like you, my mind boggles as to how it could have happened based on my (also very outdated) experience of the coaching set up. Probably the most likely explanation is cock up rather than conspiracy in a busy year, with focus on the big TV race, and in the end everyone being quite glad blondie lost in the hope the whole sorry issue can be forgotten.