Is this Charles?

Hi guys, so in 5B -A Gave Mona the gas mask, and i posted about that yesterday, but i have a theory and this actually could be true. A couple episodes ago,or seasons, there was a costume party, and there  was a very suspicious Man, wearing a costume that looked like this , And this was the season 3 finale i think, and why show this if he wasn't going to be shown again??? okay i found out this was the episode of ''Now you see me, Now you don't'' And he was later seen wearing a gas mask!. Maybe this was a clue to -As Identity and the more i look at him, the more he looks like Jason?!

Was the gas Mask a clue?

http://www.intellygentsia.com/i-recap-pretty-little-liars-season-finale-after-not-watching-all-season/

I know ezra was in this costume but still :)