Grammarians offer more than one account of the praise construction. One treats an implicit pronoun as the agent and «رجلًا» as its specification; another organizes the overt constituents differently. The rhetorical explanation must not present a disputed syntactic option as incontestable.
The important question is how the movement from a generalized appraisal to its explicit human target heightens praise.
Syntactic featurePotential rhetorical effect
Initial pronominal vaguenessArouses attention
Later specificationIdentifies the kind of praise
Naming the praised personLocates the praise in a definite individual