All classes are somewhat helpful for different elements of the raid. Some subclasses are less useful than others in the raid. Titan Striker and Hunter Bladedancer the least useful for the current raid, saying that you can skip the jumping puzzle with the supers of said two. Bladedancers can also go invisible for Gorgons if required. and Titan Smash can clear out adds in portals for oracle phase. Sunsingers, Titan Defenders are probably your two most useful subclasses for the current raid. A lot of people consider Hunters are the least helpful, but in our strategy they are incredibly useful, constantly generating orbs for others. Clearing out oracles in no time with 4 GG shots. Reality is you can complete the raid with 6 warlocks, 6 hunters, or 6 titans.