It's common knowledge that Bungie loves 7. The achievement lucky 7's, Destiny Day, 7 possible chests in the VoG, and TDB weapon cap was 331(3+3+1=7). Make question is what do you think Bungie and the Destiny team will do on the 7th year of their 10 year plan? Also let me know of any other sevens. I was reading there's seven corrupted ghosts or something.