I've downed Titan with some amazing scholars. They make Titan mechanics look like nothing. They know how to time virus and keep the whole party up over half health through 8+ stomps.

In coil my group has both a SMN and SCH. They are both amazing additions. The SCH recently leveled a WHM and will ask what I'd prefer her to run. I will always say SCH. The damage mitigating skills of the SMN are also really helpful in rotating virus and E4E cooldowns.