Absolutely agree, right now at least. I'm pretty sure there will be an episode or two showing how he conquered the blonde twin-tailed tsundere (this is so tired Grisaia made an entire character just to make fun of this cliche) and the black long-haired kuudere (this is so tired Grisaia made an entire character just to make fun... whatever).

Katou being interested in him is perfectly logical. It's a matter of lacking options. No one even notices her, then this guy suddenly sees her as a heroine.