[quote=@Renny]
[@Sep] Honestly the Dark Side wanderer serves little purpose to Byleth's overarching plot. His real purpose was to get Elda Beh out of the picture and Byleth to the temple. But he ended up providing some "angst" for young Tes as well. Internally, the Dark Side wanderer will probably play a minor role. Externally, unless you wanted to use him or something, I wasn't expecting him to make another appearance. 

Also the illness on Elda Beh was an experiment by the Dark Side wanderer.  
[/quote]

I dislike the use of story elements that are solely for 'angst' especially as during war time there's 101 plausible reasons to have them return to the temple. The Council even periodically called people back just to relax and chill for a bit.