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Yamato using mokuton.
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All of the qualifications are there really, and Mokuton isn't a Ashura thing, its a senju ability. Sakura was the only one in the manga who really had intel on it and showed interest in learning it, so that she could save Naruto from himself.
She already replicated and improved his healing ability, via Tsunade. Byakugou:Creation Rebirth
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And mokuton buddah even has a byakugou like marking on its forehead.
Also the trinity seems to be
Kuruma.Susanoo.Mokuton.
Mito. Madara. Hahsirama.
Naruto. Sasuke. (sakura?)
Ashura. Indra. (...?)