but it's probably true that he's been the most reliable leaker on average
You aren't a good leaker if you get major stuff wrong all the time, and the stuff you get right are educated guesses that even lowly readers can make.
You aren't a good journalist if you're willing to post bullshit you know is untrue, especially if it raked in extra money like you mentioned in another comment
He's a bad leaker and a bad journalist.