Case 1: A student has not heard the examination result. The teacher says “نَجَحَ خَالِدٌ” (“Khalid passed”). This is ibtidāʾī because an ordinary report is sufficient.
Case 2: A student says, “The news of Khalid's success is uncertain.” The teacher responds “إِنَّ خَالِدًا نَجَحَ”. The listener's hesitation makes this a ṭalabī use.
Case 3: Someone declares, “Khalid absolutely cannot have passed.” The answer is “وَاللَّهِ إِنَّ خَالِدًا لَنَاجِحٌ”. Multiple emphatic elements counter strong denial: an inkārī use.
The reported success is the same, but the hearer's situation determines the reporting style.