Lysonic
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Nature chakra keeping an imprint of 'memories' within it if the user of nature chakra was powerful enough both makes sense and surprised me. Like you said, there is enough relevant similarities already present in the story to make a theory about it.. good catch.. have my stones.
oh i just had a thought, what if the emptiness sasuke saw in itachi's eyes was because of the mangyeko sharingan?? itachi had to use them to win against that many other uchiha and we know that using them before they upgrade to the eternal mangyeko state makes him go blind. his eyes were literally empty because he couldn't see sasuke properly anymore!