Without giving too much away, the reason the next chunk of CWKB uses rhyme royal stanzas stems from where that chunk takes place.

The poet they probably shouldn’t have sent. I watch anime and am sometimes accused of reading books. I'm writing a long gay giant robot story in verse—probably this millennium's best yuri mecha epic poem, through lack of competition.
'Now praise those names on tombs of steel engraved | And toll this rotting country’s countless bells.'
Without giving too much away, the reason the next chunk of CWKB uses rhyme royal stanzas stems from where that chunk takes place.