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At least a part of this should be Sushio, judging from the making of documentary. The Obari punch could be him as well.

http://puu.sh/kAtST/7faa7f438a.jpg

Though he could be assisting with animation directing so I'm not 100% confident in that claim.
The punch could also be Akira Amemiya, I think he was in the KA list.