What does “qalla aw kathura” clarify about the opposing requirement?

Muʿanʿan Transmission: Possible Meeting, Evidence of Hearing, and Continuity

• After one meeting all that narrator’s reports become automatically authentic
• Reliable proof of some hearing, whether little or much, can meet that particular condition
• Only hearing a large quantity can satisfy the requirement, never a little
• Regardless of amount, each individual report requires its own explicit “I heard”