Why is a long pedigree by itself insufficient for iṭrād?

Tawjīh, Serious Intent in Jest, Feigned Ignorance, Qawl bi-l-Mūjib and Iṭrād

• Because perfect paronomasia is required
• Because correct sequence and unforced fluency are essential
• Because only one name can be stated
• Because a past-tense verb is required