Kamui is the dickbag who, upon hearing someone say they are immortal, says "I can change that."

I'm so sorry.

But he does actually have some small experience with family loss and partial regain that he would never, ever bring up outside of mind-altering events like this. So. That could be a thing. He is so terribly stupid about anything that isn't BATTLE though, so all Shino can expect in that regard is lots of effort with zero profit.