I do believe cowboy guy is an angel aswell but how could have Z knew we met him? if u tell Z u like dramatic movies in ep 1 or smth he suddenly gets really defensive when he asks if you have met a guy with an eyepatch yet(cowboy guy\Uriel) therefore I believe if we have told Z we have met Uriel he would've gotten angry. long story short my theory is that one of our friends or Alvin is the angel. My guess would be Xander or Alvin