Venom's DM here:
Our disagreement stems from the text's usage of the words 'YOU', 'YOUR', 'MY'. When the text says one of those words, is it referring to the class in which the text is written or the character as a whole? For example: '....your illusion (pattern) spells...' could get confusing. YOUR could mean the character as a whole including any other spell casting class or YOUR as in your character as an oracle.
Venom and I talked a bit about a Barbarian/Rogue combo related to the discussion. Could such a character rage and sneak attack at the same time? Sure. BUT, a 12th level Barbarian / 1st level Rogue can't sneak attack as a 13th level rogue. It's a class specific ability that doesn't stack with other class levels. The abilities 'power' is based on that specific class.
Another consideration I had was 'divine' vs. 'arcane' classes. IMHO, Oracle is 'divine' and Sorcerer is 'arcane' regardless of class powers. I see the Oracle gaining his 'Awesome Display' power from divine magic...not arcane. I see the sorcerer's bloodline powers affecting the 'arcane' part of him. That is, the arcane magic is the 'conduit', if you will, that allows those powers to manifest. I just don't see how a divine supernatural ability could work on anything arcane or vice-versa.
I'll write more later...at work and should get back to it lol
-m