I doubt that he was personally responsible for gullum or for his escape. He was simply chosen by his father to bear the tidings.
The Elves would not have been preparing for impending war. They would likely rather just have left Middle-earth. Legolas himself said when asked "they would not have come".
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Blessed be the Lord my Strength, Who trained my hands for war and my fingers to fight. Psallm 144:1
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