"For the unexperienced, a LEGAD... ...who has never been in combat, has never been shot at, is not qualified in the operation of any weapon system, has never brought his men to action... but nevetheless wil tell the previously mentioned AF colonel if it's appropriate to bomb or not"
Okay, I'll bite. If I were to be diagnosed with cancer, I'd be wanting the support of the best oncologist I could find. In the early stages, I would not be prioritising speaking to other cancer patients (other than to find a good oncologist).
The whole point of a LEGAD is to provide the counter-point view if needed, to act as Devil's advocate as it were. If the LEGAD had done all the things you mention above then they would probably no differnt in mindset to the AF Colonel and therefore be of little use.