Board Thread:TV Show Discussion/@comment-5014364-20160308214127/@comment-26158496-20160310000200

There's two things they can do to retcon that

But I'm more inclined to believe it will be the Pink Letter situation from the books. I think people doubt it because they feel the show often heads in different directions but they've retconned stuff in the past. Either way, Jon's death is the most recent GoT scene - "traitor" may have only been the twist of the knife, not their be-all end-all motive.
 * The possibility could be that, with the Watch having so little men left since they're only just recovering from Mance Rayder's recent attack, they couldn't defend against Jon/Edd/Tormund in addition to the wildlings if Wun Wun lifted the gate to allow entrance into the tunnel.
 * Or they could just go the most likely route and have Alliser admit letting them in was a mistake but they decided to go along with Jon's killing anyway because the plot was only hatched afterwards and Alliser couldn't be certain of the Watch's loyalty when pressured with the choice of letting them through.

But yeah I'm so hyped mainly for Jon's plotline this season, the clear as day wink-wink nudge-nudge hints they gave us with his scenes in the trailer just makes me so excited.