The people bringing up gear hit the nail. Not too long ago, my FC was trying to take a new member through Garuda story. The three of us were all above level 50 and level synced down, while the new FC mate was a level 44 white mage. Even with the three experienced members, we couldn't do it because heals couldn't keep up. We went back after she hit 45 and had AF gear and access to Holy, and cleared with no problem.