4x20 Accelerated Man Appearance

Theory
On Rob J. Greenlea's Instagram he posted a couple of pictures of him on the set of the Flash while he was directing episode 20 of season 4, otherwise known as "Therefore She Is". One picture was really special for me. In that picture he showed himself posing next to Earth-19's Accelerated Man. This got me theorising about the episode.

Appearance
Since we already knew that Cynthia, otherwise known as Gypsy, was appearing in this episode it was quite obvious that this foto was a confirmation of the Accelerated Man being in there. Now, the thing about his appearance is that he's probably not going to have a big appearance. He maybe has a few lines as he afterwards runs off just like his previous appearance in episode 14 of season 3, otherwise known as "Attack on Central City".

Verdict
The Accelerated Man indeed didn't make a big appearance in episode 20 of season 4, otherwise known as "Therefore She Is". The only time you see him is on Earth-19 in the police department as he only runs off without even saying a word. Which hereby confirms my theory.