A report is hasan li-dhatihi through one chain with no effective independent corroboration. What is wrong with calling it sahih li-ghayrihi?

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

• Intrinsic hasan is not an acceptable grade at all
• The external corroboration required for li-ghayrihi is not established
• Absence of a second chain is enough for sahih li-ghayrihi
• Uprightness alone is sufficient to establish sahih li-ghayrihi