He still thinks Takatora is Kouta even though Kouta is standing nearby. The Takatora voice is why he ate the fruit at all.

At least he gets a bit better every time, I think. Maybe he'll show up at Gaim HQ soon and talk to Kouta, who will attempt to make him realize that Takatora was severely wounded, not dead. And maybe the fact that Takatora was wounded will let him guilt about that instead.

Yes. Kouta has his hands full with keeping his garden from becoming a forest.