From what I have seen and read, some granites are a co-dom morph, know at one point somebody was claiming to have super granites for sale (not sure who though) and others are just abberant patterned normals, hence no genetic reproduction possible.

As far as your question about odds of combos, It just confused me, sorry.

With any double codom combo the breakdown of odds are as follows

25% normal
25% trait A
25% trait B
25% combo A & B

Hope that helps