What is the main force of the plural al-mursalīn in Noah’s story?

Bayān al-Ibdāl: Verbs, Nouns, Particles and Sentence-Level Meaning

• Noah’s people personally encountered every messenger
• Nūḥ is a plural noun in this passage
• Every prophetic message had identical wording in every detail
• Rejecting one true messenger rejects the shared prophetic mission