U forgot to mentiion rep rank upgrade rewards which is how they got legendary and exotic from cryptach u could get rare at best by buying and pve collection of engrams. U got engram rarity reward slightly wrong a green engrame will give green gear most of the time but it has very low chance of being white and blue (same chance for both) but never purple from a green. Purple will give purple, blue and yellow (gold is a darker tone) gear also exotic requirement is lvl32. There are yellow bounties that give exotic gear as a reward and thirs an exotic gear vender called agent of the nine i think but he/she is around for couple of days at a time never perminant like the others and only takes strange coins.