It is narrated from Sayyiduna Anas (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him), Abu Bakr, Umar and Uthman (may Allah be pleased with them) recited the qunut after the bowing. Then people's homes became far apart. The people came to Sayyiduna Uthman (may Allah be pleased with him) with a request that the qunut in the prayer be recited before the bowing, so that people could join the prayer; so he recited the qunut before the bowing.
Khulayd bin Da'laj is not used as evidence, and what has preceded is sufficient.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3137