It's actually not that complicated...
I just went to the “System” page in the RPG Maker MV database and turned off the second option in the top-right corner.
Viewing post in Bug Reports Thread - Version 1.0.x (Content Pack 3)
Edit: Fixed version is up as 1.0.7. Let me know if there are further problems with the new version.
As I said though, I had "start invisible" on for a reason. If you start visible and then try to immediately toggle Mezz to invisible for the intro, he may flicker on screen for a bit during the intro depending on loading and other variables. Starting invisible is the preferred way to go to make sure that doesn't happen, but that in turn means I have to be sure to force visibility on for the gallery scenes. This fix seems to be working, have to get a few other things done and double-check it though. Should have it up in a few hours.