What is the grammatical dispute about coordination before inna’s predicate?

Conditions of the Predicate: Ellipsis, Reconstruction and Expression

• Whether treating gharīb as an adjective of Qiyār resolves the issue
• Whether the predicate of inna must be deleted in every clause
• Whether nominative coordination to the underlying position of inna’s noun is allowed before its predicate
• Whether wāw can coordinate nouns only, never clauses