I am in the camp that Skittles was from the other tower. The straw that I grasp is that Skittles says he recognizes Kalani. Kalani does not recognize skittles, but Kalani was only there a couple of days before its fall. I think the other tower had a lot more people in it. They sent out a team of scavengers with ~20 people. It is kinda like asking the new kid in a school. He might not recognize everyone, but everyone would recognize him.

Ink was headed towards a criminally insane type hospital. Maybe skittles was there as a pyromaniac or something. But, we have not seen any evidence of criminal behavior in skittles.