Personally, after reviewing this a bit, I'd say the strongest RAW with no errata is that someone placing a D-Charge will take an auto-hit from the defence system (i.e. option 2)
Actually it specifies CC Attacks. "Any CC Attack made against the Heating Unit will be a Face to Face Roll" RAW there is no mention of anything outside of CC Attacks. That's why using the place deployable skill doesn't interact with it. With that said I still intend to probably just ignore the ADS it's a really stupid rule that doesn't add anything of value to the game, like Xenotechs.
Xenotechs made for pretty useful human shields. Not necessarily intended, but it definitely fit in with the Yu Jing theme.
Well, we are working with version 0.0 of the ITS 13 mission document... maybe this will change by the time we get to version 1.