I see what you're doing.
However the things you mentioned are apart of the Genesis framework. There are 2-3 menus that come registered by default. It might be for those as well? And this is also the first time I'm working with it, so I'm trying to mess with as few things as possible for fear of breakage lol.
They have their default theme (which one buys), and then a suggested child-theme template to build off of. I'm building off of their suggested CTT just to get the hang of this non-sense. Probably WON'T be using it in the future though lol.
But I do have one last question...my footer menu doesn't seem to be centering the way I need it to. I'm pretty sure there's some block of code in their BS that's obfuscating what I'm trying to do. Any help with that?