What does «li-annahu yaqtarinu bihi awwalan» explain?

The Separating Pronoun (Ḍamīr al-Faṣl): Restriction, Emphasis and Predication

• That the pronoun always follows the predicate
• That the pronoun is an object
• Why the pronoun is discussed under states of the musnad ilayh
• Why all sentence terms must be indefinite