What does Abū ʿAwānah’s statement in report 78 directly establish?

Narrator Criticism: Corruption, Concealed Sources and Chronological Testing

• Abān read the report aloud to Abū ʿAwānah
• An explicit confirmation of connection to each of Abān’s earlier teachers
• Independent corroboration of all the reports’ wordings
• The removal of any need to examine Abān’s precision after the recitation