[@Sep] Well I didn't realize that would affect my chances of joining the Rp. The Dark Side user is kept ambiguous specifically because I believed it would enrich Byleth's character simply by experiencing the macabre and unknown of the Dark Side as well as the brutality of the Clone Wars. I know I used 'angst' sardonically but It wasn't meant to imply that I wasn't taking the character seriously. Of course I put a lot of thought into Byleth and his future developments. If you'd like I could attempt to expand on the Dark Side user but it might not seem as organic or genuine as the rest of his profile.  

As for the 101 plausible reasons, I simply didn't consider them as I explored his story in my mental before writing it down.