For a long time I was thinking Angel, but I think his relationship with Scratch works itself in a different way.

Can't believe how many people are sticking with King Datu the Resourceful.

Kelly seems too obvious. I like the Pegs theories, but I don't particularly believe she could justify it to herself, unless she mistakenly believes that selling out to the Mallers will make them all safer. She cares about Michael too much. And as for Kalani, I agree with what 7odd said.

So who else? Riley...? But what on earth would her motivation be?