Neither previews nor the first few days/weeks/months are going to see this ride operating at full capacity, especially after technical rehearsals were scarce. I've personally heard that, optimally, 14 trains can be on at the same time, but I agree that's never going to happen because it's not a bunch of robots riding and operating this coaster; we're unpredictable, fallible humans so it's unlikely it'll ever run at its optimal capacity. Still, with time, it's VERY likely that more and more RVs will be added as ops improve with time and experience.
If it makes you happy to say you were right based on day-1 ops, have at it. But also be prepared to eat crow in a few months if they're running twice the numbers you keep harping on about.