Likewise, the "elune is 100% titans" are on the wrong too: Velen noted a connection between naaru and Elune, something tyrande denied but someone from blizzard (maybe Kosak himself, don't remember) confirmed that "Velen knows what he says usually" and so they are likely related. It's true also that the Night elves THINK elune was in the Well, nothing proves was true, as it's true titans are "arcane matters" which has little to no connection with the showed light-like powers elune likely has. Last, It's confirmed elune is a true diety, while titans are not.
In the end, it's all speculation: I like the theory of elune being the Soul of the world-soul, or that it's some kind of world soul placed in azeroth's biggest moon, while I really don't think she's a keeper or wild god. She's something more, not even a "regular naaru", maybe some light-equivalent of the void lords.