I take the existance of the Moria Balrog as evidence against your view that there were only seven. I look at it this way: The Balrogs did not escape after being deployed against the armies of the West. The Valar, Maiar, and Elves wouldn't let them get away. I figure the escapee, or escapees, must have gotten cold feet(or at least flightly less fiery feet)they had seen the size of the approaching army, and slunk off. Now, if there were a hundred or so Balrogs at the time, as I suspect, a Balrog or two sneaking out the north exit to Thangorodrim or something wouldn't get noticed. Whereas, if there were only seven, someone would definitely notice and tell Melkor that one of his crack regiment was running away.
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