Was Ulquiorra the most powerfull of them?

I wonder about this because of his "Resurrección Segunda Etapa", I mean he was so powerfull not even Ichigo was able to beat him, his inner hollow had to beat the hell out of him. I think that he might be the most powerfull of them all, but he got killed by that awsome hollow. Who do you think could defeated Ulquiorra if it wouldn´t been Ichigo´s hollow? Do you think he was the most powerfull?

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