Not exactly. I believe the way Jim Hull formulates narrative arguments in Subtext, which is the only place I ever actually see one laid out for a work, is by combining Growth, Judgment, Outcome and Problem. I might be missing something, but that should be pretty close.
Two of those items, Growth and Judgment, are related directly to the MC, and the others are OS. Though, Problem is shared by Changed MCs. So, it's a mix.
The Main Character flaking out and causing problems for all the other characters isn't really a MC throughline. The MC's throughline is about what is causing problems for him, and how he goes about trying to resolve it. Whatever problems he's causing for other people are in another throughline.
For example, in The Fugitive Richard Kimble (Harrison Ford) is an escaped convict trying to clear his name. All the stuff about clearing his name is the MC throughline. All the problems spiraling out from him being an escaped convict are in the OS. Kimble's actions and the evidence he uncovers create problems in the mind of the Marshall tasked with capturing him, Gerrard (Tommy Lee Jones), as he comes to terms with why Kimble behaves so differently from a typical escaped convict, and those problems are in the IC throughline.
I'll assume the OS Problem in your story is Avoid, and the MC is Changed. In the MC throughline Avoiding facing his fears can be what's causing him problems without the OS being about facing your fears. What causes problems in the OS is avoiding or preventing... anything. It doesn't matter what it is that's being avoided, only that avoiding causes problems.
The Problem in OS and MC in Star Wars is Test. The Empire tests the limits of its tyranny. It destroys Alderaan because Dantooine is too far from civilization to make for an effective test demonstration. And so on. That's the OS. The MC is about being a rube from the backwater of the Galaxy and feeling the problematic need to test yourself and your limits at every turn to show everyone you're really a big deal despite your humble origins.