[@Oliver]

You're absolutely correct. The collabs (which we are encouraged to do) certainly don't add the same kind of information to the storyline as Ciel's incessant status of being violently ill to the exclusion of all other activities. 

Were one to read the posts, one may notice that (particularly for Ash) this is a character building moment. Don't get me wrong, his gradual alteration from being an well balanced guy to hearing voices and shutting people out almost entirely to having an emotional breakthrough (while retaining personal ethic) isn't quite as involved as Ciel suddenly having an onset of nausea, but I'll take what tiny accolades I can get for my efforts. 

So far as it affecting no one? Any character with relation to Ash might notice something different about him, IF he happens to take an action contrary to his usual routine. If one doesn't metagame, it leads to character development of their own. If you want to keep your guy in a glass bubble of dead weight and stagnation, go right ahead. He will be treated accordingly by the other characters in play as he is presently: With a mix of annoyance and pity. 

Please try to expand your scope with this. It's why we're here. God forbid we might actually create something and have a little fun while we're at it.