Who speaks in «وَقَالَ مُسْلِمٌ وَسَمِعْتُ أَبَا غَسَّانَ»?

Narrator Criticism: Al-Mughīrah b. Saʿīd, Shaqīq and Jābir al-Juʿfī

• Sufyān reporting his own hearing from transmitters
• Abū Ghassān learning directly from Muslim as hadith text
• Jarīr presenting his meeting in Muslim’s name
• Muslim introduces his own hearing from Abū Ghassān