I would say that is a very complicated questPaint/Nazca/Sentinel/Speckled ion. While Paint/Nazca/Sentinel/Speckled are all "Granite" like in the heterozygous form, and very similar looking in the homozygous form (therefore quite possibly different lines of the same gene, though they could turn out to be like Cinnamon and Black Pastel), has there been any documentation of people breeding them together to test compatibility (I do know of 1 breeder breeding Paint to Sentinel this season and hoping to have results this summer)? So adding that variable to the extreme variability of what people call Granite, you would be hard pressed to have any results that you could be confident in. A first question would be "Which line of Granite are you using?" Another variable to take into consideration is if the line of Granite that you are using is a dominant line or incomplete dominate (since Paint/Nazca/Sentinel/Speckled are incomplete dominate)? I think it is a very interesting question, but I wonder how long and how many pairings it would take to get results that are statisically significant?
I would like to see Lesser Spark (since the Paint/Nazca/Sentinel/Speckled make some great Yellowbelly combinations). The possible pairings include Spider, which may make identifying Paint/Nazca/Sentinel/Speckled animals difficult.