A blue caique?

Someone brought this to my attention via the caique forum. A picture was found, and posted, of a supposed blue mutation caique!
There has been a lively debate going on as to whether this mutation is possible. We know that other supposed caique mutations have been reported, yet there is only one living specimen that has yet to be positively identified.
Is this mutation fact or fiction? Personally I am leaning towards it being bunk- the way the orange on the nape still shines through the white makes me suspicious. Add to that, that the picture used is actually of a pair of pallid caiques, and this gets even curiouser! Pictures of pallid caiques are rare, to say the least. The probability of this mutation being real? Slim to none. But its an interesting thought, isn't it?