I've been airlocking Command Wrap Kirk since day one. Once I got Nexus Kirk, and made him my avatar, the lower level Kirk's became undesirable, and since I didn't get them early on, were never a factor for cadet missions. Maybe at some point going forward when I have crew space, I may indulge in leveling them, but not at this point.
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There's some 1 stars that have super-rares in their mix. Its kinda absurd. Talos Spock was a bear as well on the 3 star level.