I've not read this entire thread, but Kevin's explication is excellent. Further food for thought are the excellent materials on stanza in Fussell's Poetic Meter and Poetic Form and In Tim Steele's All The Fun's In How You Say A Thing. For flawless examples of interstanzaic enjambment study Wilbur's Hamlen Brook where he weaves a sentence of say 17 lines across quatrains and justifies each stanza break by the shifting imagery.
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