We know Kol was freaking psychopath and so that's a reason to keep him down, but what did Finn do? For 900 years no less.

Given Elijah's reaction to the news of Mikeal being dead, I would believe that Finn's daggering had something to do with him. Perhaps Finn put them at risk due to his vampire loathing nature when they tried to escape him? Or perhaps Klaus felt such paranoia at Finn's grief that he couldn't trust him to go on unchecked? Either way, Elijah seems to believe Finn posed a danger of some kind, I wouldn't blame him considering the man's actions since waking up, so I would lean towards the former of my theories.

Enough out of me, what do you think Finn did?