While *********** has overall better translations sometimes Mangapanda translates some parts better. Often it's best to read both versions to get a broader picture of what it means.
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"An acquaintance of an underling of mine showed me this..."
"This is something a partner of one of my men randomly did."
So just fill in the blanks with both of these. Who are Madara's men? White Zetsu, Black Zetsu, Obito. All the other Akatsuki were not formed until after Madara died so he didn't get to meet them. Kabuto does not count as one of Madara's men because he blackmailed his way under Obito's wing.
"An acquantance of one of my men randomly did this to me."
Sure, we know it was Orochimaru's research originally but Madara has been gone for a long time and didn't know that. Orochimaru only experimented on Hashirama's cells about thirteen years ago before he left the village. So from Madara's perspective it is KABUTO'S WORK (Plus Kabuto was the one who modified him, not Orochimaru).
Madara did not die with that Hashirama face on his chest since he could not replicate Hashirama perfectly. At best he had the imperfect Zetsu material. Hashirama noticed the face and assumed it was Madara's work but Madara corrected him on that. What's so confusing on this?