Why I think Gavilar was behind the trap a the Rift:
He was scared of Dalinar, especialy after the deadstare.
he doens't need him anymore after. he was king and secure.
Tanalan was acting strange before the battle.
Its implide that he had the support of someone highup like a highprince. (i say the king)
Tanalan didn't want to give the name of his benifactor at first.
Gavilar is very manipulative.
When Sadeas arrives, he is hell bent on destrucion of the whole city.
The scouts betrayed Dalinar and I dont think Tanalan has that kind of power or influence. (but Gavilar does, He also has spies in his army becouse he knows of Evi dead) (The most loyal army solders to Dalinar all died)
I think Gavilar made a deal with Tanalan to kill his brother, the murderer of his father who stole his birthright. And after join the kindom. But Tanalan was suprised by the peaceful and honorable conversation to stop the war. That is why he was acting strange. But he still wanted him dead, and he made a deal with the king so he had to follow though. Dalinar wouldn't belive him if he was honest anyway, and would likely get angry like he did when he said that Sadeas was helping him. But at the same time Gavilar didn't want anyone to know of this, so he order Sadeas to arrive later (after the dead) and make exemple of those who opposed him as king, to cover up his involvement.
We need to see Gavilar more like Sadeas. manipulative, ambitious, scheming, exz
