The most unexplained, Asspull ability is...

[Your Creepy Stalker]

Mokuton.

I mean, why does this kid randomly have a kekkei genkai that neither of his brothers has, No senju has ever had before him, and none of his children have?

 

[Henchman24]

You should listen to your sig.

 

[Lil Soybean]

Your sig explains it

 

[Lil Soybean]

You should listen to your sig.

Dang. Beat me to it.

 

[Young Thug]

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[Made in Heaven]

Your sig explains it.

.....but really, Its similar to the case how not all uchiha have sharingan or how not all kaguya have bone manipulation, perhaps wood style is an even rarer kg than sharingan or kimimaru's bones.