"And someone's advice"

[Tui]

Notice how Kabuto saves sasuke with the 2nds advice?

Spoiler

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Me thinks the 2nd knows/suspects how Madara survived the fight with Hashirama. I highly doubt it was as simple as injecting Senju cells into him, as Kabuto wouldn't need anyones advice to do that...

 

[Sir Blades]

I think you may be reading a bit too deep. But it could be a possibility, Tobirama is very knowledgeable.

 

[Madara Uzumaki Uchiha]

I thought he was talking about itachi's advice to find himself.

 

[Urda]

Madara just survived. No if or buts about it. Similar to Obito slipping through the boulders, it was a miracle. We know what this mean, Rinnegan.

 

[Tui]

I thought he was talking about itachi's advice to find himself.

But he says "using my knowledge and someone's advice" which I thought sort of implied it was advice to do with saving sasuke. But yeah your interpretation could be right too.

 

[Zantos]

I posted a threat , talking about this one earlier today , that caught my attention too !! but it seems people mostly believe he was talking about Tobirama !! I personally doesn't have any guess about it !

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[Mr Hiru]

This someone could be Tobirama (the nearest character with high knowledge for saving Sasuke), or Itachi (by the advice that moved Kabuto towards this answer of saving Sasuke)