^Neither do I see Thanos losing. Sersi is almost useless against Thanos, and BB's scream is about all they have. Even then, Thanos is unlikely to be out down by a single scream, given his shields and durability. As for Thanos' power against the scream, Thanos had enough power output to make the universe itself scream. I would say that is some pretty serious power, even if you downplay the Galactus feat, which was also another good power feat.