Ah, right, thanks for reminding me about the engine-damage-ignored thing. They are indeed using the hybrid's logic to keep the group together, though they're already doing something a bit different so that the coordinate-ee's show up in the threat count, and I could just have it use that same flag to disable the engine-damage-ignoring behavior. For the hybrids it's really part of the idea that they hold their group together through that, but for these it's just a convenience to avoid having to pick similar-speed ships, etc.