Who is the most useless character in the middle open-world part of the game? Detective Bennet is the only one who is authorized to use City Archive. Ray is needed for accessing DNA database and introducing the quartet to the Wizard. Only Anna can go to the Morgue, and only she can get the medicine/placebo for Wizard. Ed? The only thing Ed must do is accompanying Anna to the Cemetary. He is indeed using everyone.
In the New World Order ending, if Ray chooses to publish his article, the news reports afterward show Antevorta collapsing and the Eleven Foundation arrested, whereas if he doesn't publish, they succeed in taking over the world. That's pretty influential, for one news article in a blog. Keep in mind, though, that the Eleven Foundation has fed articles to Ray in the past, including the one smearing the Vice President, specifically so they would have a news source they could use to disseminate information they wanted into the public consciousness and/or blackmail people. If the Eleven Foundation helped Ray become a success as an independent journalist, then whatever framework they set up to support him would also work against them when Ray turned rogue. Hoist by His Own Petard, anybody?