I was hoping to collect some wisdom around whipping boys. Lots of questions:
How do you pick a planet to turn into a whipping boy? Does the choice matter much? Should it be on a critical chokepoint? It seems like you'd definitely want a system with only one wormhole leading to friendly systems, at least.
How many whipping boys?
How much are, say, ion cannons worth? Is it worth capturing a planet with ion cannons just to serve as a whipping boy? Same for gravity drills, attritioners, OMDs, etc, but ion cannons are the most common.
Does the arrangement of wormholes on the planet matter much? Obviously its better if all the enemies come from one direction, but is it better for the wormholes to be close, medium, or as far apart as possible?
Is it worth warp gate raiding to ensure all waves come in through a single wormhole?
Kahuna's guide suggests putting the turrets as close as possible to the friendly wormhole, but this seems to sometimes cause the incoming wave to turn around and leave without ever getting to the defenses (maybe just due to the wormholes being really far apart, or AIP was low). Is there a sweet spot for the distance to the hostile wormhole?
What unlocks (player or AI) or minor factions inform your whipping boy tactics?
Personally, I usually try to ensure that the enemies only come from one wormhole (gate raiding if need be but preferably starting with a system with few hostile entrances), and I usually capture a system with a high mark ion cannon and/or OMD where possible. I've tried building all my defenses very close to the wormhole, and that worked great except that mines were fairly useless. I've tried building as far back as possible, but then stuff turns around and leaves. Currently experimenting with leaving just enough space for the enemy to fly through minefields, then hitting tractor beam turrets, with turrets piled so that they at least cover the tractor turrets.
So far I've mostly stuck to having one whipping boy and just reinforcing the heck out of it, but I could see multiplayer or multi-HW games favoring multiple whipping boys, since then the odds are better that the double waves go to different planets.
It seems like sniper/bombard-type AI unlocks would strongly encourage building defenses so that the hostile wormhole is covered by turrets.
Currently working on a vanilla campaign (no expansions), so I don't have as many defensive options as I might like.