I'm pretty sure i've read the entire thread and I have one question that i'm unaware of a clear answer to. I know that ATC "suggested" they head to an alternate destination. I know that the pilots elected to a landing attempt with the understanding (or so ATC thought) they would abort if conditions were unsuitable. I do not recall any clear indication that the approach was flown as a "PAR" approach....so did ATC call out the glide slope errors?
My understanding is that any plane not stable on the glide slope at a certain point is normally going to abort simply based on that instability regardless of other factors.
If in fact ATC did call out the error I can't fathom how/why TOGA wasn't immediate once the instability in reference to glide slope was recognized??