After speaking to Ivy earlier tonight, I've found another of Devil Wolf's Chimeras and have taken her pedigree. Similar descent as the boy Coverboy posted earlier but in gyazos of Kittycats pedigrees.
Chim Givin Stud (a Burmese - Blue) was mated with Chim Taker (an Ocicat - Platinum) and made a Ocicat- Platinum Kitten. So Chim Givin Stud must either hide Ocicat-Platinum or something more recessive.
Chim Givin Stud was mated with Chim Lady (an Australian Mist - Blue Marble) on the paternal side of the pedigree and made an Australian Mist - Blue Marble Kitten, he had passed his hidden fur. Which we know to be Ocicat - Platinum - or something more recessive.
His two offspring were then mated and made Chimera Fire Eyes, the only explanation for that is that Chimera - Black Grey must have been hiding under the Ocicat - Platinum fur (and under the Australian Mist - Blue Marble) but for the purposes of this proof it's the hiding under the Ocicat - Platinum that matters.
Which, as Coverboy suggested, makes it the new most recessive fur.
Mum
Dad
Maternal grandmother
Maternal and Paternal Grandfather
Paternal Grandmother