User blog comment:Relaxing94/Natsu vs Lucy (sooner or later)/@comment-173.69.32.29-20140822213527

Assuming this END theory is true, then I think Lucy might play a big part in whatever happens with that. I'm not sure about them actually fighting against each other though. Gray has demon slaying magic now, making him the perfect match-up for END. So that means again, assuming Natsu is END, then we will see Gray vs. Natsu. A fight that has been in the making way before Lucy even met Natsu.