I have a big CAC collection and I do think this marble could be Christensen. I think the "9" you are referring to is a 'turkey head'. That doesn't make it more valuable, however. Alley made some flames that are very hard to differentiate from CAC.
An important thing to remember, NO one is right all the time when it comes to marble identification. Bob Block, Chuck Sumner, the amazing Ron Shepherd and others sometimes miss the mark. Keep an open mind when you get opinions regarding marble ID’s.
Like "All About Marbles" told you, this is an Alley. We all have marbles we would like to be something other than what they are, but it's not a CAC. Agree with Fire and with AAM.