A lone route involving a mastur narrator has a compensable weakness. What is needed for its grade to improve?

Hasan li-Dhatihi, Sahih li-Ghayrihi, and al-Tirmidhi’s Composite Terms

• Treat being mastur as proof of full uprightness and precision
• Effective, genuinely independent support and assessment of the weakness
• Treat continuity alone as sufficient repair of any weakness
• Treat the mere presence of two routes as sufficient without checking them