Craig is not Satoshi Nakamoto. Nobody knows who or what entity Satoshi Nakamoto is. Whoever is Nakamoto could easily prove it by transferring some exact amount at an exact time, announced beforehand, of the funds in the account that is known to be controlled by "Satoshi Nakamoto". Nobody, including Craig has ever done that.
Any fool can claim to be Sakamoto. Craig is no fool but he is very eccentric to say the least. The burden of proof is very much on him.