I always thought "John Doe #2" looked an awful lot like Lon Horiuchi, the agent who killed Randy Weavers wife while holding her child.
John Doe #2 was Hussien al-Husseini who got a job at Logan Airport after OKC. Husseini was likley a member of Unit 999 at Salman Pak. Jayna Davis can connect dots between OKC and Iraq.
He looks like Jose Padilla.