Allmost- While I agree with most of your post, I think you neglect the fact that this fish is cost and availability prohibitive to a majority of the people in this hobby. That ultimately means that there is a much smaller group/sample of people to "experiment" on how to keep this fish long term in captivity. Also, there is only Rufus collecting these fish at ridiculous depths, so it will never be as common as say a yellow tang, or even a Bandit for that matter. Most Bandits being collected are not taken from 400+ft. So obviously Bandits are more commonly collected and are affordable enough that there have been many hobbiests over the years that have gone through the trials and tribulations of keeping one. Other than the most recent Peppermints, there have been 1-2 people in the last 15 years, to keep these fish on a long term basis.
Also, because Rufus and his team are the only collectors of the Peppermint, there is no one else to compare the way these fish are collected and handled...meaning that if there was another few divers who collect, and they are more or even less successful with providing healthy fish; then what are the differences and factors that could lead to better collection and long term success of this fish.