Totally!
The hardest part about headcannons, at least for me, is figuring out which ones I support and which ones I, well, don't. Often, I'll find a headcannon or ship that doesn't make much sense to me (like TwiDash) and think 'no, I don't think I'll support this one,' but then when I read the fic/comic, it's very well written, and everyone is so in-character that I can almost picture it happening in the show.
Ah, the struggles of living in the fandom...