If he is impaired. I would suggest a messaging app. How will he ever raid without talking? He would put an undue burden on any raid team, etc. So if they constantly wipe because someone else may do his call outs. Everytime people get mad at him they are labeled as being prejudice against the handicap. Just leave the mission alone and let bingo release it as a nightfall reward. I have 7 cloaks and I have not used even 1.