The number seven though, explains how there were enough to beat Ungoliant during Melkor's trauma, but not kill her. If indeed there were 20-50, wouldn't they have slaughtered her, I mean even if they ran, they went with winged speed. And legions of Balrogs could be interpreted as seven or so legions each led by a balrog, such as legion of Gothmog, legion of Durin's Bane, etc.... I just think that with that many of the balrogs, Morgoth would have reigned supreme easily.
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"I come from yonder...Have you seen Baggins? Baggins has left, he is coming. He is not far away. I wish to find him. If he passes will you tell me? I will come back with gold." - Khamul the Easterling
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