To what extent is the whole scene between Creon and Tiresias crucial to the development of Antigone?

Plot

Impacts chorus - convince Creon to change his mind - shifts plot from focus on Antigone's death from ep 2 onwards to saving her. Crucial as new direction - Creon always stubborn edict ep 1 - sentencing Antigone to death ep 2, doing it ep 4

Sense of hope not as crucial, already established in ep 4, reinforces

Gods in the plot (believable to audience) - crucial as sense of seriousness - Aristotle

Stubborness/pride

Shows peak of pride - 'not even if Zeus' eagles rip the corpse' - crucial as extent is shown, only now speaks against Gods…