Why is the wāw of “wa-bullightahā” not ordinary coordination of equivalent reports?

Iʿtirāḍ and the Relative Measure of Ījāz and Iṭnāb — Concluding Volume 1

• Because the insertion is a prayer, not a parallel report
• Because wāw is always redundant
• Because the first clause has no verb
• Because both are adjectives