Can manumission be the dower: Abu Hanifah said it is valid only with a dower

Jabir bin al-Aswad narrates from his father: I took part with the Prophet (peace and blessings be upon him) in his Hajj. He said: I prayed the morning prayer with him (peace and blessings be upon him) in Masjid al-Khayf. When he (peace and blessings be upon him) had finished his prayer and turned his blessed face, there were two men sitting at the back of the people who had not prayed with him (peace and blessings be upon him). He (peace and blessings be upon him) said: "Bring them to me." They were brought to him (peace and blessings be upon him), trembling. He (peace and blessings be upon him) said: "What prevented you from praying with us?" They said: "O Messenger of Allah (peace and blessings be upon him)! We had already prayed in our lodgings." He (peace and blessings be upon him) said: "Do not do that again. When you have prayed in your lodgings and then come to a mosque, pray with the people (in congregation), for it will be a voluntary prayer for you."

Bishr or Busr bin Mihjan narrates from his father a report like the one mentioned above. It is mentioned that the view of (Imam) Abu Hanifah is: The Fajr prayer is not to be repeated (with the imam).