Contreras is the one that has the best chance to be special. He has the 4th highest WAR among catchers with at least 150 PAs this year. He could easily end up a 4 WAR catcher this year.
Of course Murphy leads all catchers on WAR so it's not like the trade isn't working out for us.
Langeliers and all the pitchers all have a chance to be special. The talent is obvious with Langeliers and of course pitchers are lottery tickets. Also, Malloy is hitting well in AAA, albeit with a high K rate.