And there we go
Proclaimed directly to Yamutto's face that if there's a powerful figure in Wano, they'll be able to deter invaders.
You don't need to be Einstein to realise that figure obviously isn't going to be Momo. Excluding the omniscient narrator stating Momo lacks strength a few chapters back, GB literally laughs at the idea and was seconds away from making the world's first dragon shish kebab, if it wasn't for (an outsider) Shanks saving his ass. Hence definitively proving that whilst Momo may have the dedication and will, it's clear as day that he doesn't have the strength to actually protect the country on his own.
Momo wants the "
people of Wano" to be able to take care of themselves. Which is gonna culminate in Yamao being accepted as a samurai, retainer and their newest guardian figure to replace her father. It was honourable of Momo to grant her leave, but nonetheless, she will stay by her masters side like the good dog that she is.