This is not accurate. Mosconi hopefuls made special trips individually to see Mark in St Louis, including, I seem to recall, some training time spent as his Lindenwood College pool facilities.
If Johann doesn't come until October to teach, the focus should move to the 2018 Mosconi, for maybe next year is the one in which Americans will be taught how to develop the skills in which they show deficiency in Mosconi after Mosconi.
If you're right, Johann is far more of a figure head than a coach. My guess is that you are wrong.
Only a couple of them did that, and then only for a day or two. I don't recall SVB doing more than the absolute bare minimum of Mark's team exercises and exhibitions.
I don't think you can hold Johann to this high standard of a long-term coach working day-in day-out on drills and the like, when previous captains have not done that. Mark Wilson did the most for sure, but even that was very little (through no fault of his own), and he was fired. If your argument is that Johann can't be USA captain because he can't spend the time needed with the players, that's a double standard.