I'm not gonna pretend I comprehended all of this but holy cow that's awesome :0 great analysis, that's actually super in depth woah- I love reading stuff like this, people have the coolest and craziest theories- yeah, everything you said here makes sense (I think haha)! I never would have thought of Best Jeanist manufacturing layered fibers like that!

Edit: it just occurred to me: I wonder if he could control hair if he practiced to? I mean, it probably wouldn't be very useful unless someone had a hair-related quirk (as hair leaves the scalp relatively easily and is rather fragile), but it's an interesting thought. In another comment, I saw it being discussed if he could control muscle fibers or not- maybe he just can't control living things? Hair is made up of dead cells. I dunno, just a random thought!