You're talking about flash to get shadows up when RDM can ichi between attack rounds on pretty much anything, even without debuffs?
Regarding survivability vs damage reduction, PLD wins out in damage reduction. However, shield blocks aren't guaranteed.. -50% physical damage is. I don't see how you can make a case for PLD having better survivability when their primary damage mitigation with shadows down is reliant on a dice roll <_< They'll take less damage over time, but an unblocked tourb or a triple->TP from byakko or <insert other rough physical damage here> can kill a PLD much easier than it can a RDM.
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