At bold. You've just said the trees were created from his chakra, just like a fireball that's created from Sasuke's chakra can be absorbed even though it's a real fire, how is mokuton different? It doesn't matter if Sasuke then adds more chakra or whatever to make the fireball larger it was original created from his chakra and can be absorbed. The tree's source of life is Hashirama's chakra.
You can try to write off petra path as a hyperbole but so far the manga hasn't contradicted with the databooks in this scenario. I'm not just using the databook to support my argument. Also this isn't just about Nagato this also applies to when I see people say Hashirama can beat Edo Madara or Tobi.
Because Sasukes Katon consists out of Chakra, the trees themselves do not consist out of Chakra. The only Chakra you can meet is in their roots, which are converted into a source of life. He does not control the tendrils with Chakra inside them, he controls them from the ground from their roots, where their Chakra is.
Yeah, the Rasengan, Katon and Rasenshuriken are Chakra which are converted into a form. The Mokuton on the other hand isn't. The Mokuton consists out of real trees and the Chakra isn't converted into the trees, it is converted into the roots which are in the ground and let real trees grow from there. Even the Databooks agree with this.
If Sasuke adds Chakra into his Katon, the strength of its attack rises, but it is still a form of Chakra. But if Hashirama wants to increase the growth of the trees or to control them, he isn't controlling the tendrils with Chakra, he is sending his Chakra in the ground where the trees source of life is.
This was my last post to this topic.