@Tom Imrich
While I'm not a believer that RNP/GLS solves all the world's ills, in this case the IAN kind of ILS-look-alike for practically all instrument approaches has merit.
This crew, like their colleagues, flew relatively very few non-precision approaches, and even though CDFA has it's merits, the kind of "roll your own" Rube Goldberg add on procedure to the NPA just begs for crew error.
If they could have selected and flown an ILS-look-alike approach for Rwy 18, the outcome might have been different. The NTSB Operations Group Report pretty well highlights the numerous operational errors and failures of this event. Doing an operation the same way they do most of them could make a huge difference.
IMHO