if the circle is the amount of chakra kurama has, and the dark/yin is permenantly sealed away, does it cease being a circle? or does the yang compensate the difference, i think the removal of the dark of the circle/sealing of the yin does not make the space where the yin resided unusable, nor does it mean that kurama's capacity to hold chakra was halved, it just means the entirety of kuramas ying chakra was sealed away and that had an immediate affect on his appearance since hes composed of chakra , just like oro regained some use of his arms, its entirely plausible that kurama would be able to make use of the void left by his yin chakra