Uncanny #306 is actually the issue where Warren & Jean fight the Hodge Phalanx, with Candy. I'd assume this issue would be in a Phalanx X-related OHC, be it prelude (with the subsequent Uncanny issues) or the Covenant itself.
I had forgotten about these three horrendous* Annual X-overs. Thanks a lot!Annual #16 was part of the Shattershot crossover, and Annual crossovers generally have not made an appearance in the OHCs. One would hope we eventually get a TPB of them, maybe combining all three of Days of Future Present, Kings of Pain, and Shattershot for the sake of efficiency :)
* hate to diss an Art Adams drawn issue.