How can one reconcile the different sayings of scholars regarding the authenticity of the Hadith "My Ummah will split into seventy-three sects," and determine which of these sayings is the most correct?

The hadith (definition) about the splitting of the Ummah states that the Prophet, peace and blessings be upon him, said: "My Ummah will split into seventy-three sects, all of them in the Fire except one, which is the Jama'ah (the main body of Muslims)." In another narration: "what I and my Companions are upon." This addition has been authenticated by the majority of Muhaddithin (hadith scholars). It has also been reported with the wording: "all of them in Paradise except one," but this wording is fabricated and falsely attributed to the Prophet, peace and blessings be upon him. Al-Bishari is not a hadith scholar, so his authentication cannot be given precedence over the statements of the Imams of Hadith.