The total Duh factor is this:
While he's testifying about what OTHERS DID (connections, decisions, etc) HE IS IN THE MIDDLE OF THOSE SAME CONNECTIONS, DECISIONS….
In other words, since he was joined at the hip with Comey, Brennan, Page, etc anything he "spills" regarding those specific people, in essence, is the VERY THINGS HE HIMSELF IS GUILTY OF….therefore, with this "deal" he gets off the hook….
I mean, what else is there (when it comes to HIM) that we could get him on???