And another one bites the dust. I believe this places it...
AM-DC recessive to Bali Blue and Dominant to Foxie Cocoa & Cream.
'Spark' (AM-DC) was bred to 'Hadiah' (Bali Blue), and produced a Bali Blue shown furred offspring, 'Blue Violet'.
'Violet' was then bred to an Aussie Blue mate to reveal her hidden fur, and produced an AM-DC kitten.
Since we already know that Aussie Blue is recessive to AM-DC, the AM-DC fur had to be Violet's hidden fur.
Thus AM-DC is recessive to Bali Blue.