How is «Allāhu» analyzed in «la-yaqūlunna Allāh» in the source discussion?

Conditions of the Predicate: Ellipsis, Reconstruction and Expression

• The accusative noun of inna
• The only analysis is Allāh as subject with khāliq as omitted predicate
• Allāh is the overt agent of la-yaqūlunna
• The nominative agent of an omitted khalaqa