[Ken's ears shift a bit when Chikusa says his name, but he doesn't actually move from his spot on the floor. He knows proximity affects the healing acceleration he can provide; he'd had plenty of chances to observe the process while healing Ayumu. So while Chikusa might want to leave, Ken isn't going to budge until Gojyo's at least fairly well healed - or unless Hakkai sends him away. Which is the other reason he's not moving; Hakkai (and, to a lesser extent, Gojyo) accepted his help, so Ken's going to provide it until either it's no longer needed or he's told to stop.
He visibly twitches at Gojyo's words, before letting out a long, low whine. He doesn't necessarily believe what Gojyo's saying is true - for one thing, Hibari came back after disappearing once, even if he'd lost his memories, and for another, Gojyo has a history of believing weird shit that doesn't make logical sense and Ken knows it - but the very possibility distresses him. And there's no way to reassure himself after hearing those words and thinking those thoughts, no way to comfort himself that Gojyo's wrong.]
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He visibly twitches at Gojyo's words, before letting out a long, low whine. He doesn't necessarily believe what Gojyo's saying is true - for one thing, Hibari came back after disappearing once, even if he'd lost his memories, and for another, Gojyo has a history of believing weird shit that doesn't make logical sense and Ken knows it - but the very possibility distresses him. And there's no way to reassure himself after hearing those words and thinking those thoughts, no way to comfort himself that Gojyo's wrong.]