LF Colby knows more about Charlies past work than Don

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Another hard subject line (any suggestions? I'm all ears).  What I'm looking for are any stories out there where Charlie in the past did a lot of work for the other alphabet agencies and some of it was hands on.  What if he was in Afghanistan while Colby was working his magic with numbers and had saved Colby's unit several times.  I can just see him earning a nickname like 'Wizard' or something (or it could even be his codename).  And when he and Colby meet up he's all excited and shaking his hand saying what an honor it was to meet him and he almost slips up and calls him 'Wizard' but Charlie's glare at the last moment switches it to 'Whiz Kid.'  They could grab lunch later with Colby apologizing that he thought the FBI knew about his past which is why he almost blew his cover.

Any stories out there like that?  If not anyone up to the challenge of writing it?

Thanks again, Mina