Except that was for the main roster of Brawl. The main roster is bundled together. DLC doesn't have to be.
At this point, as I've said before, if you aren't Top 15, you're probably going to have issues. You have characters like K.Rool, Isaac, Inklings, Snake, Wolf, Bandanna Dee, who have all probably gotten hundreds of thousands of votes, if not millions. Then you have a retro who not nearly as many people voted for. Why the f would they add the retro if they're going for "fanservice"? It's not logical.
There honestly aren't too many feasible choices of characters they could add that fit Ryu's criteria. I would argue Snake, but he's a top contender in the ballot. So are Inklings. I really can't think of any other characters.
Fanservice means that it's going to be something that pleases a majority. DLC characters are not the same as main roster characters, because they need to be able to stand on their own. We already have Mewtwo, Roy, Lucas and Ryu to prove that. The next characters need to be able to do the same, and the ones I mentioned will easily be able to do that.