I don't think that Glorfindel's rebirth had anything to do with his strength. He had been very close to Idril's family in his "first life," so he seemed like the likely candidate for rebirth, so that he could stay with Elrond (Idril's descendant) and his family, to help them in their fight against Sauron.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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