There are a few breeders in Australia with ino birds masking violet (some on thie forum) so ino does mask it, just as it masks blue and grey etc.
They just appear as albino birds, or creamino's if the turquoise gene is present.
I think Ring0neck here has a Creamino masking violet that he can vouch for.
Now... it could be a freak of nature... but I cant see anything in what the parents could produce as being able to produce that colour.
Now... with all things with just one simple series of photo's like this, with no photo's showing development, no pics of the parents, and not being able to proove without someone just 'saying they are legitimate' you are always going to have alot of people saying 'its fake'.
Since you know the guy, can you get pics of the parents? (in nice lighting) and the 100% formal genetic listing that goes with them?
Cobalt Violet split ino can be two different things... because from pure genetics... cobalt violet split ino, is a dark green violet split ino. If its not green, it means its also carrying blue, ie; dark blue violet split ino.
Cobalt is effectively a darkening, not a specific colour itself.
Can you let us know what other colours came from the nest? Get some pics of the parents?
I honestly have never seen a dark blue violet ino bird (cobalt violet ino)... however... that colour combination certainly doesnt lend itself to 'pink or red'.
I had a young creamino with pink feet just like that, and the same colour pink on its belly and chest... here is a pic of it before it went really pink.
The colouring was caused by a red calcium perch... walking on it and rubbing up to it etc... so its quite easy to fake this sort of thing with albino birds, hence why alot will jump to fake in the breeding world.
Just as a note, there is no real 'cobalt' gene. The name cobalt refers to the 'dark' gene with blue... making blue appear cobalt in colour. Single factor dark blue birds are cobalts, double factor dark blue birds are mauve.
The dark gene will set next to any other mutation and act accordingly with the base colour and ino. If the bird is a dark green ino.. its a yellow bird... same with dark blue ino's appear albino.
If you want to check out the effect of ino on cobalts and violets and see that they can / are masked, is to check out the pallid violets, and pallid cobalts that are around, no pink tinge to the heads etc.
Similar to the effect with the clearheaded, and cleartailed mutations, they appear as white or coloured to the blue hues where appropriate.
In the end, im curious to see what comes of this. However... its the feet above anything else that make me disbelieve this as being a natural 'mutation'.
Edit: curious how the shafts of the feathers remain white... yet the vanes show colour (feathery part of the.... feather....)