https://twitter.com/seijikanoh/status/822439727005474817
https://twitter.com/seijikanoh/status/822441211487105026
https://twitter.com/seijikanoh/status/822441562533601282

0:00 - 0:09: Yoshihiro Osugi
0:10 - 0:13: Makiko Futaki
0:14 - 0:15: Yoshihiro Osugi (1 cut of the fan)
0:16 - 0:17: Yuichi Tanaka (1 cut of the broken ceiling)
0:17 - 0:18: Shinji Hashimoto (2 cuts)
0:19 - 0:25: Atsuko Tanaka
0:26 - 0:28: Hideaki Yoshio
0:29 - 0:32: Shinji Hashimoto
0:33 - 0:38: Nobuyuki Takeuchi
0:39 - 0:53: unclear based on Kanoh's descriptions
0:54 - 1:03: Eiji Yamamori
1:04 - 1:10: Shogo Furuya

Is there a reason why there are so many artists on this one scene.

was talking to dragonhunter about it and he guesses this was Hashimoto's scene originally. However, from what he read, Hashimoto and Miyazaki didn't get along well on this movie, though he doesn't remember the source and how accurate it is.

IMO that would explain a lot if true.