Feedbecks since his return should be removed and account should be locked until the real wardrick comes back. No need to exclude him from default trust unless there is evidence that he has been hacked before may.
He can create another account to sign the message or email Theymos, if he comes back
theymos has already locked it :

Now his account actually was compromised because he posted that link. I locked it for now.
For the question about defaultTrust, maybe he will be removed (for security reason) once the admin will verify the account.