Anyone can claim , but only one in each case can prove it . That's the point we are now , proving in court . Either he is or he goes to jail for perjury and other things . Isn't that great ?
Do you really believe he is Satoshi? Let's leave the court asides for a moment. Do you find the overall "evidence" convincing to you?
If i steal your keys am i the owner of your coins ? Or am i a thief who illegally posses your coins ? And more importantly , if i steal your keys am i you ?
No, but if you claim to be me, and you have other ways to prove such a thing (like a drivers license), then a signed message from the PGP is at least required. You can't claim to be an anonymous person with no evidence apart from forgeries. Satoshi, whoever he is, posted a PGP key. This, along with the genesis public key, are the only elements which can certify his identity. Beyond that, not much else is known about him.
You can't treat potentially everyone as Satoshi. Everyone is not Satoshi until proven otherwise. And as time goes by, these signed messages will count even less as solid evidence due to the development of quantum computing which will sooner or later be used to compromise his keys.
Satoshi had 2 PGP keys with MIT server. Aaron Swartz hacked MIT to destroy Satoshi's PGP Keys. Aaron Swartz is not dead as his dead donkey drama were staged to fool the government. His full names then was Aaron David Swartz but he has dropped Aaron from his names and now he is known by is last two names. Any one can fool any one but not their own grandfather.
Satoshi does not need to prove anything to any one and he is not craving for a Nobel Prize in economic.