this bit makes sense, John thought maybe, MAYBE, Sherlock was on the mend; that he was on his way to being a normal human being. But now he can see the cold hearted thought process and he sees now how Sherlock has regressed. ---> THE FEEEEEELS
The funny thing is Mary said this to john in the empty hearse. John-"I don't shave for Sherlock Holmes" Mary-" you Gould put that on a t-shirt" coincidence or a catch phrase Mary first heard somewhere else?