Gary, I can not offer the definitive answer to your question, for the simple reason that no one knows.
I remember that I said that you would probably end up using it as a finisher after another one. For finishing on water, it is one of the slowest Coticules I ever tested. Use it on an edge that's anything less sharp than an already perfect edge and it doesn't do anything at all. You know I hate grit ratings for Coticules, but just for the sake of example: let's say you had a 50K grit synthetic hone. If you would use that hone on a perfectly shaving 8K edge, it would not offer any advantage at all, for the same reason as an 8K hone does not work on a 1K edge. The step is too big. Or put otherwise: the finishing properties of this Coticule are very subtle. So subtle that someone without the proper experience would never know it's true brilliance. When I enter hones in the Vault, I have usually honed 3 razors on them. That gives me a fair idea about their potential, but what I don't know is how far they will eventually go in the hands of someone how really takes the time to unleash their full potential.
That is basically what I've been saying all along: Spend enough time with a fixed honing setup, and you will become better and better in using that setup.
With the coming up experiments in the Researchers' Mess, I hope we can investigate about the finishing differences of a few Coticules. It will be interesting, but also holds the risk that people will overestimate the importance of the hone and underestimate the importance of skill. A common mistake.
Allow me to tell you a little story:
About a month ago, my eldest daughter needed a new accordion. We hired a beginners instrument for three years and it was time for her to upgrade to a better one. We visited the store, owned by one of Belgium's leading accordion players. The had a selection of instruments on display, with price tags between 3000 and 20000 EUR. The guy played some of them and I could clearly hear the difference in quality. He's one of the best. My daughter tried some of them as well, and I could hear no difference whatsoever. He pointed us to an instrument that will fit her talents, unless she decides at some point to pursue a professional career on the accordion. Which is unlikely. She plays lovely on it, though.
Did you get the point?