The closing discussion also includes indefinite plurals where number, kind, or relative rank matters. Consider two passages:
فَقَدْ كُذِّبَتْ رُسُلٌ مِنْ قَبْلِكَ
Messengers before you were also denied. (Fāṭir 35:4; “many” is the rhetorical reading of multiplicity.)
وَرَفَعَ بَعْضَكُمْ فَوْقَ بَعْضٍ دَرَجَاتٍ
And He raised some of you above others in degrees. (Al-Anʿām 6:165)
In the first, the indefinite «رُسُلٌ» evokes earlier messengers without naming each one. In the second, the indefinite plural «دَرَجَاتٍ» highlights differentiation in ranks. Neither expression supplies an exact numerical count by indefiniteness alone.