Brian did know, he might not have known how bad it was, but the information Yuzu had problems with his left foot and so didn’t go to Toronto until quite late got around before Boston. But anyway, the information Yuzu was injured was never made public anywhere apart from Japan - so if someone read translated stuff (like TAT), they knew, if they didn’t bother, they didn’t - like BESP commentators. Brian didn’t ever mention the injury anywhere apart from Japanese media, I think. Barely even to them.