Gin: And how are you going to be my right-hand man now?
Kira: I'm ambidexter, Ichimaru-S-A-N.
Kira is now officialy alive, he is under Kurotsuchi's care. Kubo will probably give him his severed arm back, but we yet to see Kira healed. Meanwile I can use the lost limbs for a joke. As for Gin, there was no funeral, so in my headcanon he is alive.
Ambidexter is a person who is both right and left handed. Kira held his sword in left hand a few times in the anime (can be an animator's error, doesn't change the fact).
characters: Kira Izuru and Ichimaru Gin