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Yes it can be possible, but not necessarily. At the time of Tuor withdraws to King's place and subsequently to the tunnel, Morgoth armies had razed Gondolin (even from the north that means the north had few enemies), and could come from wherever you want.
But the development of the battle (although very brilliant) is not so deep told, and I think we must not complicate more about this question.
Greetings
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