You just know that once the fight's finished, the Vindice will begin to take mukuro's body back but then tsuna steps in with the "he may have done bad stuff to us, but he's part of my family speech" so the vindice set him free and this moves mukuro's heart which makes him finally accept tsuna and the vongola and fully gives up on trying to take over his body ensuring that the daemon incident will never repeat itself for future generations.

cause honestly, i find chrome absolutely useless and pointless. That other girl who has a crush on mukuro hits it nail on the head when she mocks chrome