My game is currently on a simple map type. As such bottle-necking to only one or two planets is impossible. (Yes, I do only have one planet where they send waves into, but that doesn't stop freed ships from spreading around, and thus triggering resistance ships to spread all around.)
The effectiveness of the new minor faction behaviour may be HUGE for some map types (like X, snake, tree, spokes, and other map types where limited exposure is possible due to the abundance of low wormhole count planets), but very detrimental to their usefulness on other map types (like simple, realistic, grid, lattice, crosshatch, and other maps where limited exposure is impossible due to the scarcity of low wormhole count planets)
Of course, those are the best and worst cases, but they highlight how hard it is to get a behavior that will be sane in most cases if that behavior does not also include a check for its own current state (like how many other resistance ships are planning to go in, or something).