Felt like Rei would actually become like Souya Meijin if he had not met Hina, families and friends, he was in a similar trance daze state.
Other professionals have something else in real life that keep them motivated and replenished to get back and keep fighting in the abyss. Except for Souya, he seems to be peacefully living inside the abyss, satisfied with just meeting guest challengers inside his silent snowy home.