[Spoilers] Maybe Kaguya did have Byuakugan from the start

[Gulvklud]

Byuakgan activation without handsigns

Either she had the byakugan from the beginning, which would explain how she knew to each the fruit or she has an improved version of it, like with her sharingan.

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[Made in Heaven]

Isn't it obvious. I mean, to me it is.

 

[EVlL]

yes. she might have had it from the beginning

 

[BLAZE]

Yes Yes
She was NV X ray machine without
CHAKRA

 

[VongolaX]

Called it...

 

[ShadowBandit]

She was hyuga....but she had the awesome power of the shairgan/rinnegan thing.....

But she didn't do anything special with the byakugan that we didn't already know.....she looked into Naruto and Sasuke chakra and so ishda or asura chakra presence.

 

[mohdzarif]

Idk. The eyes that can see chakra and chakra points are using chakra itself.

So without eating the fruit, means no chakra, means no Byakugan.

Maybe she obtained Byakugan after eating the fruit.