Why can two reports both graded intrinsic hasan differ in strength?

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

• Hasan requires routes from at least two Companions
• Only agreement in wording matters more than all other conditions
• Once graded hasan, all its internal levels are equal
• Because precision, clarity of connection, and supporting indications vary