A
It is not a power up like the RS.
Did Sanji need to lose something to use the RS? No
Did Zoro need to lose something to use Enma? Yes he lose Shusui who is a blade of the same grade as Enma.
Enma is not a power up it is an exchange.
Did Sanji need to lose something to use the RS? No
Did Zoro need to lose something to use Enma? Yes he lose Shusui who is a blade of the same grade as Enma.
Enma is not a power up it is an exchange.