Thiqah (ثقة) means a reliable narrator; awthaq (أوثق) means the more reliable narrator in this comparison.
• Ḍabṭ (ضبط): accurately remembering or preserving a report and transmitting it correctly.
• Itqān (اتقان): proficiency and accuracy in transmission.
The comparison here concerns accuracy of transmission; having a more famous name is not a substitute.