Titan jump is about all they offer. Yea yea bubble but that can be provided by a 2nd Titan and you'll get their orbs for super. That jump tho can get you to Crota ASAP for max sword time. Warlock revive allows recovery for hard. Everyone is usually safely lined up in center so killing oversoul is non issue. Radiant skin (armor) plus the helm that regens hp on super makes them a straight tank. Some of the fastest times have been done with a Warlock. Hunter obviously has the tools for maximum hits per knee. A good Hunter is there, safe, and swinging even with a bad group that struggles with shield. Give them a few orbs and you have a reliable class to 2 sword Crota.