I believe it's Kirkland.
The on-screen handshake was visible, and slightly awkward.
His agents broke into Jane's "office" and photographed his research, allowing him to easily "predict" Jane's 7 final suspects.
He knows Jane was in a mental hospital. During his stay, Jane likely told his doctors about his "happy memory", so all Kirkland had to do was request the doctor's files in the name of homeland security.
If I were Jane, I'd organize a meeting of the 7 of them at CBI HQ, and have the blind woman pop out of a door and identify Roy Tagliafero.
