1) Some of his on-line writings show lack of mastering English adequately. However, there are examples of other on-line writings of his where he clearly masters English. If Dorian is indeed the Bitcoin founder, he either enjoys trolling or those poorly written excerpts are decoys to divert any on-line researchers seeking Satoshi Nakamoto off track.
But then again, wouldn't using an alias be a better way to throw them off track?