If an intrinsically hasan route receives strong independent supporting evidence, what stronger cumulative grade may result?

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

• Hasan li-dhatihi because corroboration never raises cumulative strength
• Sahih li-dhatihi because the new route changes the first narrator to fully precise
• Hasan li-ghayrihi despite the first chain already being intrinsically hasan
• Sahih li-ghayrihi