This is why we don't let titans think... Eris is not a leader and did not lead the Crota team... she works for Ikora ray-warlock, she leads a special forces team and was the top crucible Contender. Osiris-warlock scholar created a few guns and researched the Hive.. Then there is cayde-6. Head of hunters and one of the original hunters to scout earth after the fall. The speaker head and only voice of the traveler. Theorized to be a warlock because of his knowledge and study... . I could go on and on there are alot of warlock and hunter legends The titans you speak of well they are in charge of crucible related tasks... Because they can't be trusted to aid the tower with more important tasks....