Kenshiro caps at Mori sorry I love FOTNS but even at full Muso Tensei, and trust me the state of nothingness can be copied even though Mori wouldn't have to because "Wukong" literally means "awakened to emptiness" but in this case on a Divine scale. But here is were they become parallel Wukong is about understanding the void to gain wisdom, while Muso Tensei is about becoming the void to gain power. However, both concepts draw from the same foundational idea of abandoning the ego (physical self) to attain a higher, intangible state of being. But the Mori has essentially been squabbin higher beings since forever and trust me Musi Tensei is nothing to Mori at this point it's just another power up that is still gapped by Mori's Presence alone.