I loved seeing Lilia and Darren on ITT. Lilia is my all time favourite pro - she was so good and such a wonderful teacher. And I'll say it again - Aled woz robbed ! 
I don't know what the conflab was before Vicks DO - but I tend to believe the BBC that it was just technical logistical stuff - Alfonso was new judge maybe just running it through with him or something.
When it all boils down - Vick was the lowest scored on the night, so she basically already knew the judges decision - she didn;t so much dance badly as have a bad dance, whereas Seannnn danced badly, so he had more room to improve in the DO (I don't think he did improve actually - but he was still initially scored higher than Vick)
Graziano is the wrong type of dancer for this show - he might be very good at what he does, but not sure he has the right dance background. Vick also mentioned the language barrier on ITT - which must have made teaching and learning more difficult. That said, I thought he came over as a nice chap on ITT, but I still don't want him back next year.
I suspect the PTB were looking for a new Gleb and thought Graziano fitted the bill. Which is slightly insulting to the audience if that is the case.