It's really quite confusing. Briscoe doesn't mention Debussy doing any actual orchestration, but supervising Koechlin's. The piano score was issued by Durand in 1912, so Debussy clearly approved that issue (hence my listing it as the original version). Apparently, a ballet performance was scheduled in New York for 1916 - which is why Koechlin was engaged to orchestrate the score - but fell through. By 1916, Debussy was already suffering from the cancer which ultimately killed him. If more information surfaces, things can always be changed easily enough. Koechlin's orchestration is really quite wonderful, so it's entirely possible that Debussy had a more direct hand in it. (Though Koechlin was certainly a very fine orchestrator as well.) Correction: Briscoe actually does mention Debussy as starting the first few pages of orchestration with the remainder being done by Koechlin on another page.
So, it's a case very similar to Boite a Joujoux, where Debussy orchestrated the first 94 measures and left the rest to Caplet. The piano score was issued a few years before the orchestral score in that case as well. Hmmmmm.