Which contrast between apparent incompatibility and īghāl is accurate?

Iṭnāb: Clarification after Ambiguity, Tawshīʿ, Repetition and Īghāl

• The first adds a verse ending; the second joins incompatibles
• The former resolves seeming conflict; the latter adds a nuance at verse end
• Both necessarily start with a dual and then two nouns
• The first singles out one praised person, the second names a specific after a general