I'd like to see it again too when I get the time, it will be on the ITV website as every stage is for about 20 days.
But having seen it about three times, and I may be wrong, but looked at in a different light, Cav remains in formation with all the other riders to his left and not moving away from them to his right as you would see a bigger gap appear to his left and the other riders, but off top of my head, it does not happen, which clearly shows he did hold his line and the barrier does come inwards.
But there again it can be argued that his line should also have moved outwards in relation to the barrier, and also having read many times how he studies the end part of a course meticulously and also gets briefed up by his people at the end, maybe he knew before he got there that the barriers came in and would help him by following a certain line that anyone coming up the inside to the right would fall into a trap and be caught out.
Don't I talk crap. (Am I allowed to use that word on a Sunday?)