فهو للتخصيص إن لم يمنع منه مانع
It yields restriction, provided there is no obstacle to that reading.
The proviso ‘provided no obstacle exists’ is essential. A restricted reading must fit the context, grammatical construction, and communicative purpose. Where exclusivity is inappropriate, a different function of fronting should be considered.
Thus the ordinary report «زيد حاضر» cannot always be translated as ‘Zayd alone is present’. Such a reading may require a competing person or possibility in the discourse.