Usually last aggressor resets on a new street, but never in an all-in situation, so the "shark" has to show first in this case.
I've had people in both cash and tournaments say the whole "you've got it" line and my response to that 100% of the time nowadays, due to angle shooters and other unsavory jacktards, is "then muck." Otherwise they're showing first.
This whole thread feels like a level, by the way. A subtle one that got less subtle as the story continued.
My theory, OP is posting on behalf of someone else to show them, via the responses ITT, how bad the thought process was.
If I'm wrong, I apologise OP, but I've never seen a post from you that had this jumbled a thought process, so I suspect either the above or a reverse HH where OP is villain and trying to post from "hero's" point of view.