Lol I just think that it's considering Shanks and Blackbeard are lasting much longer in this story than Linlin/Kaido, that is completely reasonable to think any one of them could have harmed him (I think it was actually Shanks) during the timeskip. Not an insult to Kid at all.
It actually is one of the main reasons i think Shanks is not as good as people think. Kid, while clearly selfish, is obviously a good pirate in terms of maintaining his honor (hates Apo for betraying him) and respect (for Killer's laugh). Destructive, but inherently good based on his actions in Udon and how Killer and him interact.
For Shanks to not see this and totally mutilate him (as a crew or himself, whatever) seems VERY out of character, unless it's not actually out of character.
I'm curious as to what happens after Wano ends, because Kid intended to go after Shanks again before Apoo betrayed them all. Clearly there is some vendetta going on, and I hope Kid elaborates on it or hypes of Shanks in that way.