I don't see the comics as canon. That entire arc completely ruined the drama of Luna's character. But we'll see in season 4 what's the truth and what is not. Though I hope it's not. Luna being just possessed is lame and strips her of responsibility for her actions by turning her into a victim. That's bulltrout.
"Canon until proven false by the show" is how I see the comics as they are official Hasbro merchandise, as are the books produced such as Twilight Sparkle and the Crystal Heart Spell. Not only that but it was made a rule for the writers of the comics to work with the writers of the show to avoid contradiction.