Abu Hatim bin Hibban al-Busti: I do not know him for his righteousness or criticism, but he narrated some strange things that he was not followed upon, despite his little narration. Therefore, in my opinion, he should be avoided from being used as evidence for the narrations he uniquely narrated.
Al-Dhahabi: We do not know him
Ali ibn al-Madini: Unknown
Muhammad ibn Ismail al-Bukhari: I do not know who he is. Abu Ishaq al-Subay'i narrated from him, and his trustworthiness is questionable, due to some irregularities.