After fighting with Yaakov Avinu all night, why did Eisav's Malach have to go that morning to sing Shira before Hashem. From all days, this had to be the one? The answer is a resounding YES!!! The malach was created so that he should LOSE a fight. Eisav ALWAYS succumbed to his Yetzer Horah. The malach had a daily disappointment with Eisav. Now, for the very first time since his creation, the Malach was bested. He lost a fight. He fulfilled his goal! He is now ready to return to Hashem. He can now proudly proclaim: MISSION ACCOMPLISHED!