I don't know where this came from, but it's circulating in Twitter that Chinen's blood type is AB-Rh negative.
If this is true, then Chinen's got a really rare blood type for an Asian. There are only 0.1% of Asians with AB-Rh negative blood type. He needs to start doing autologous blood donations now so that he'll have stored blood if ever the need arises.