Although he was no longer Hashira, he was the first one you trained with now. A group of young Demon Slayer was definitely not something he could sense acting Hashira to train, which is why he chased you around and scolded you so much. He put his hand on your shoulder when you were eating with a terribly tired look: "If you don't finish every last crumb, you'll be left with people like you for an hour of extra training."