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Not sure exactly if this is the scene that this person think Sugiura did, but the gattai scene in op 1 should be Okiura, so they might have been talking about this scene from Op 2?

あ、Vガンもですね(^^ゞ
OPのヴィクトリーガンダムの合体シーンの原画もたしか杉浦さんだそうですよ

https://x.com/Lunamoon55/status/1330509587259281408?s=20