JuicieJ
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Well I'm not 100% positive to it either, it was just something I came up with while writing... But we don't know if the Skyward Sword will be more powerful than the Master Sword or not.
I see what you're saying, but I would assume that an evil-sealing blade would be the most powerful, especially after a transformation. The Master Sword is the Excalibur of the Zelda series.