“Wa-lākinna Allāha yusalliṭu rusulahu ʿalā man yashāʾ”
“Rather, God gives His messengers power over whom He wills.” (al-Ḥashr 59:6, excerpt)
The surrounding account relates to a specific episode involving the Prophet Muhammad. The plural “His messengers” can therefore be discussed in relation to this particular Messenger, yet it retains a broader statement of divine support for prophets.
Specific application and general formulation need not conflict. The immediate narrative identifies a concrete case, while the noun can express a general principle.
Do not erase the collective wording simply because the historical application includes a particular individual.