وإن كان دونه في البلاغة لفوات فضيلة توجد في الأول
If the later expression is inferior in eloquence because it loses a virtue found in the earlier.
An effective earlier image may become vague, clumsy or less suitable after reworking. This loss of a specific expressive virtue, rather than brevity or unfamiliar diction alone, explains the critical judgment.
Comparison should identify the exact excellence that has been lost. Simple personal dislike is not a sufficient analysis.