فإن كان المخاطب خالي الذهن من الحكم والتردد فيه
If the addressee is free from a judgment and from hesitation about it.
For such an audience, an unemphasized assertion is normally appropriate. Someone neither knows nor is actively debating whether Zayd arrived; «جَاءَ زَيْدٌ» can provide the needed information.
This is ibtidāʾī reporting. Its simplicity matches the communicative need. Being khālī al-dhihn does not mean ignorance of the language itself; it describes the addressee’s stance toward this particular proposition.