Marriage without a guardian: Abu Hanifah said it is valid if he is a suitable match

It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that Sayyiduna Sa'd bin Ubadah (may Allah be pleased with him) asked the Prophet (peace and blessings be upon him) about a vow that was binding upon his mother, who had died before fulfilling it. He (peace and blessings be upon him) said: "Fulfil that vow on her behalf."

Ibn Buraydah reports from his father: I was sitting in the presence of the Prophet (peace and blessings be upon him) when a woman came and said: "Two months of fasting were (binding) upon my mother. May I fast them on her behalf?" He (peace and blessings be upon him) said: "Fast on her behalf. Tell me, if your mother had owed a debt and you had paid it, would that have sufficed?" She said: "Of course." He (peace and blessings be upon him) said: "Then fast on her behalf."

Sayyiduna Sinan bin Abdullah al-Juhani (may Allah be pleased with him) reports that his paternal aunt told him that she came to the Prophet (peace and blessings be upon him) and said: "O Messenger of Allah, my mother has died while bound by a vow to come to Makkah on foot." He (peace and blessings be upon him) said: "Are you able to come to Makkah on foot on her behalf?" She said: "Yes!" He (peace and blessings be upon him) said: "Then walk to Makkah on her behalf." The questioner asked: "Will this suffice on her behalf?" He (peace and blessings be upon him) said: "Yes!" And he said: "Tell me, if your mother had owed a debt and you had paid it, would it have been accepted on your mother's behalf?" She said: "Yes!" He (peace and blessings be upon him) said: "Allah is more deserving (that His right be fulfilled)." It is mentioned that the view of (Imam) Abu Hanifah is: This does not suffice for the deceased.