If shit hits the fan.. double bubble. One titan with blessing of light and another with armor of light. Works everytime. Hope it helps in a bad situation :)
EDIT: One good use for this is surviving oversoul if your entire team is inside behind the crystal shield and someone dies. Just double bubble instead of running to the doors to try to get outside and shoot at the oversoul. With Helm of Saint 14 the thrall (if any) will be blinded and entire team will have buff to kill easily.
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Coolbeans but like others have said. Crota is fairly easy on normal with a good or mediocre group that can take direction. And hard mode if you dont have a good group your ass out anyway.