He doesn't need Hardy Bearing because you are tanking her on Enemy Phase. All you need to tank Ophelia is a high visible RES stat. Donnel reaches 49 RES, with Casa Blanca+ RES refine, +10 merges, +10 flowers, summoner support, and light blessing with 2 Eirs in the team. Casa Blanca also lets him ignore field buffs from Ophelia.
I don't think that is enough to deal with the Ophelia's i usually have the joy of facing in AR ... you know, those +10 +Atk LaD4 ones. Got one that downed my +Res +1 Yune once. ^^
How does this set handle the non-AoE Ophelias?