I honestly think with all the seasons I've been watching over and over the very core message of this show there trying to project is slowly changing or straying from that message. With all these theories and information we are finding they all seem to add up to Luna/NMM plotting to take the crown by defeating her sister, and then there's twilight who is I believe the biggest threat to Luna/NMM. Like come on how lucky can a pony be. If Luna/NMM is in recon mode planning to strike, then she is doing a great job she now knows that the elements of harmony dont work, she challenged her sister celestia and defeated her, can break that shining armor barrier, and those guards can't stop Luna/NMM lol remember the season 1 episode when the mayor of ponyville told them to seize NMM???.
@Firebolt blitz your welcome man i was in the same situation as you searching and hoping NMM would return and came across an amazing video and ha to show you all.