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I suspect we've actually seen evidence of Atsushi manipulating the timeline already.
"Remi, what on Earth are you talking about? Surely, we would have noticed such a thing! And also who are you and when did you get here?"
We've actually seen him do it quite a bit. But we've gotten so used to it and it arrived so early, we didn't question it:
Every time he heals.
Let's jump back to chapter seven - remember what Yosano says?
"A complete restoration" like the injury never happened. Now, my Bleach fangirl isshowing, but there's a character in Bleach with a similar prowess when it comes to healing, and it's eventually revealed that he ability is not healing, not regeneration, but negation. She undoes what has happened to restore things to how they were before. It's a time ability.
So consider: the Tiger doesn't heal, doesn't regenerate. Rather, it merely jumps to or pulls on a page or timeline where the hit never happened, restoring itself and Atsushi to full health.
Snip, snip.
*cackles in validation* Hey. Hey guys. Is Atsushi the bookmark because he’s the protagonist of the story and thus the page is marked depending on his phase of the journey, or is he the protagonist because he is the bookmark, where his very existence necessitates him becoming a catalyst so the story can unfold and be read in linear time?
Now this is what I call a fight!
Based on @whathorselegs' wish/headcanon post, about Atsushi and Chuuya fighting and Atsushi's claws cutting through Chuuya's gravity manipulation. The visual of it gripped me by the throat.