Will we find out in Gaiden?

[startup97]

Spoiler

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[lndra]

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[UzumakiRyu]

Isn't it obvious? Orochimaru's salty feelings for being passed up for 4th Hokage has made him inba mad.

 

[Pirate King]

honestly wouldnt care if we didnt see oro uttahere:

 

[sasukeism]

we might find out but i though hiruzen stated was because he didnt choose oro for hokage.

 

[DroGGz0r]

He did it for the lolz.

 

[maniaoqan]

He got daddy issues with Hiruzen.