I perceive this having no lasting consequences and in no way will this play right into the hands of Savathun. (/s)
To be fair, given that is si possible to have Lightbearers who are not inherently good, it isn't too far-fetched to believe it is in some way possible to wield the Dark without becoming/being inherently bad. On top of this, one does need to look into the very real thematic and conceptual connections between the Light and Dark with Chaos and Order respectively, given that Light is commonly associated with numerous elements linked conceptually to Chaos (passion, irrational emotion, freedom, rule-breaking (via the Gardener), complexity, etc) and Dark is commonly associated with numerous elements conceptually linked to Order (logic (a cold, unfeeling calculus is how it's descriebed in one of the Lore books, IIRC) rules/systems, slavery/servitude, simplicity, etc).
Given that memetic corruptions and hazards tend to be associated with logic-based mechanisms, it's not too out there to believe that many of the seemingly corruptiive problems wielding the Dark seems to contain have in fact been caused by memetic hazards created using the Dark but which are not
inherently part of it. This, in turn, means it's not too out there to believe that, bereft of those hazards, it might be possible to learn the ways of the Dark without the levels of corruption previously seen, or at least with it being more controlled/channeled.
Of course, this is all assuming I'm correct about the thematic links, and it's worth noting that I've yet to play through the new Prophecy Dungeon, which, if the premise is to be believed, will give us greater information on the true nature of the Darkness.
