Talents after being overcome
Antoine Bauza answered a question very similar to this one on BoardGame Geek:

[Question]1) After you have exceeded your Kiai value, but before you are obliged to pass on your next turn, can other players still pass on cards to you?
[Response]1) Sure ! (it's important )
When you exceeded your Kiaia Value, you have to brun immediately a barricade / farm. But you are force to tak ethe pass action on your next turn. So, a lot can happen before you're next turn (passing card, removing a card from your combat line). {Sic}

The direct implication to this is that:

Just because you've exceeded your Kiai value, your turn does not immediately pass.
Adding additional raider cards to a character who has exceeded his kiai value will not cause additional barricades to burn.
The character is still &quot;in play&quot; until the beginning of his next turn.

So, Kikuchiyo specifically, can take another raider, and either add it to his defense pile or his confrontation pile.