So I was grinding the echo chamber strike for imago loop for around 3 hours with my friends, I got legendary engrams of all sorts. I was also super salty because I didn't get imago loop and all my friends have one. So I called my friends to help me, we did about 5 more strikes and I got a legendary engram. I said, its either gonna be a really crappy legendary, or a good ass exotic. Went to rahool, opened it and boom, got a 310 bad juju, the only RNG primary I was missing (missing Fabians strategy, tlalloc, and ace of spades). One of my friends was super salty, while my other friend was asking me to put it on. This was one of my happiest cryptarch moments. Tl;dr: rahool is a weird bastard.