The normal function of explanatory apposition is to clarify, but this does not impose a universal rule that the second expression must be more familiar or more explicit in every possible respect. Two ways of describing the same referent may illuminate each other.
وَلَا يَلْزَمُ أَنْ يَكُونَ الثَّانِي أَوْضَحَ
It is not necessary that the second expression be clearer.
The important point is the combined effect on the hearer, rather than ranking two nouns by an abstract scale of familiarity.
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ʿAṭf al-Bayān, Badal and Coordination: Clarifying, Reinforcing and Specifying the Subject
The normal function of explanatory apposition is to clarify, but this does not impose a universal rule that the second expression must be more familiar or more explicit in every possible respect. Two ways of describing the same referent may illuminate each other.
وَلَا يَلْزَمُ أَنْ يَكُونَ الثَّانِي أَوْضَحَ
It is not necessary that the second expression be clearer.
The important point is the combined effect on the hearer, rather than ranking two nouns by an abstract scale of familiarity.