يُوسُفُ أَيُّهَا الصِّدِّيقُ
Joseph, O truthful one!
“Yūsuf” is a vocative here, with the calling particle unexpressed. “Ayyuhā l-ṣiddīq” underscores the addressee's truthfulness and reliability.
The omission of intervening narrative events and the unspoken vocative particle belong to different levels of analysis. Calling both simply “a deleted word” conceals the actual rhetorical structure.