Castle Doctrine would not apply, unless the CCW also owned the business. (Even then, in many states, it only applies to the home; there are some where it extends to owned businesses and vehicles, too.)
Stand-your-ground, or no-duty-to-retreat laws are different animals.
Sounds like a pretty cut-and-dried case of SD, though, and I'd be amazed if any charges are ever filed against the CCW.
Against the accomplice, on the other hand...
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