question #1 Sahih Muslim 330b, Book 3, Hadith 67 : What is the significance of having multiple chains of transmitters in the authentication of hadiths?

This hadith has been narrated by Amr al-Naqid, Yazid b. Harun, ‘Abd b. Humaid, Abd al-Razzaq, Thauri, Ayyub b. Musa, with the same chain of transmitters. In hadith narrated by Abd al-Razzaq there is a mention of the menstruation and of the sexual intercourse. The rest of the hadith has been transmitted like that of Ibn ‘Uyaina.