So untill yesterday, after 2 weeks of running strikes, crucible, patrols (even a hour or 2 of cave farming) and levelling my cryptach levels to 7 and 4, I only had only 2 legendary from PvP to show for my effort. I almost believed that the cryptach was bungie's attempt at Diablo's Kadala. 4 purples decrypted and no legs. So I happily soldiered on doing exotic bounties and having fun. Last night rng decided it was my 3 hours in the Sun. Got a total of 4 legendaries out of 4 purple decryptions and another 2 from PvP rewards. 2 legendaries from ranking my cryptach from lvl 3 to 4, and two more from random mob drops on mars. And the awesome part, 3 out of 4 were weapons. Moral of the story master rahool is an enigma so just have fun with the game. Good luck guardians