The latest is that the door was closed then "re-opened" where they snagged him... plane was later recalled for 2 other PAX questioned and released.

He didn't happen to get on the plane accidently and "almost get away". Based on some inside knowledge of how ICE works, they waited until the door was closed as this will make it a slam dunk in terms of proving his "attempting flight from authority" (no pun intended).