The other thing, considering John's reaction at Kitty Reilly's house, is that Don John setting up the servants to discredit Hero might also be a problem. If Greg is there Dogberry and Verges might set HIM off being reminded of Donovan and Anderson.

(and that has just made me see a similarity between dialogue a scene in ASiP and something the 10th Doctor said in Blink ...)

My brain is all over the place today. Sex will do that to you (and make you a worse typist than you already are!