That is the nature of subthreads I suppose. People answer the main question to more or less detail, then a relevant tangent appears. In this case the subthread spun off of acknowledging that the philosophers of Sigil would still not agree on or know which Ethics System to use.
You provided great detail. Quertus mentioned an interesting possbility and I wonder how it impacts these studies:
What if the Detect spells are Detect Lawful Evil and Detect Chaotic Evil rather than Detect Good and Detect Evil? In this case they are not true opposites but still don't overlap.