Board Thread:Spoilers!/@comment-26196542-20150930211355/@comment-24674051-20151012144807

And set aside the whole incident with the Squire. I can see that going both ways.

What about the theft of the Crimson Toadstool thingie? First, he was there in Merlin's chamber when Regina, Belle, and Snow discovered that they could use this item to communicate with Merlin (I won't call it a deus ex machina, since they only introduced the item in this episode and it did not magically resolve any plotlines immediately),  Arthur talks a good game regarding Merlin and his prophecies, so I would expect that he would be thrilled with this discovery. Instead, he takes extreme measures to make sure the gang does not receive the item, thus preventing them from moving forward. He says he feels bad for lying to David, but I'm really having my doubts.

I think we need to find out what his endgame is. While I will buy him being a "greater good", I think there is something else at work. Either manipulation (maybe somehow Morgana is involved and is manipulating Arthur), or Arthur is not all he appears. Lancelot's comment lends more credence to the latter.