I understand, but there is a reason to assume that, because moro's manifestations have the same power they do as when he wasn't a planet, moro didn't actually get any stronger after fusing with earth, he only could endure merus' power better, and before fusion, he was equal to UI Goku, and after his fusion he could still pose a threat to UI Goku and was able to damage him and even defeated him, so that means that if the manifestations were still at full power then they should also scale to his full lifting strength. Another argument is that, at the end moro was getting overpowered and was being pushed by Goku's avatar, so if he had all that lifting strength while essentially fighting for his life while grappling Goku, then there would be no way that he'd not use it.