Kaguya needed the army to fight...

[SageOro]

Orochimaru, he is the one "scarier than Kaguya".

He probably got sent to this planet by his clan and is one of Kaguya's enemies.

Proof: Wants to become the ultimate being, we don't know anything about his parents and there is evil in him.

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"Always been hidden in him". Other things to consider: He wears the Ootsuki Clan Clothes and Kimimaro had also a connection with Kaguya.

 

[KingHashirama]

hes stale as a villain.

 

[animals74]

damn bro u spammin these threads

 

[Legendary Saiyan]

Orochimaru was one of those villains that are actually sinister.

 

[Hyuga Prodigy]

It's Possible, Kishi did stated that Orochimaru play big role in gaiden/Movie.