Hillary aide takes Fifth: No criminal activity regarding Hillary's email problems? So, why is her aide taking the Fifth?

Pagliano
(CNN)A former State Department employee who worked on Hillary Clinton's private email server has informed Congress that he will invoke the Fifth Amendment to avoid testifying before the House Select Committee on Benghazi and in response to other Congressional inquiries related to the server.
On Monday, Mark MacDougall, the attorney for former State Department employee Bryan Pagliano, sent a letter to House Select Committee on Benghazi Chairman Trey Gowdy indicating that Pagliano would assert his Fifth Amendment right not to appear before the Select Committee for a deposition on September 10, 2015. A copy of the letter was obtained by CNN.
Editor's notes:  Understand that Hillary has thrown this aide under the bus.   Pagilano, declaring her desire (if we are to believe anything this woman says) that all aide's cooperate with House investigation (as reported on Fox News).  You should know that Pagliano's testimony is critical because he is the aide who set up Hillary's server.  For him to claim the Fifth,  is to admit to the potential for criminal activity in the cover-up of this scandal.  A central question in all this is that which seeks to establish the timing for Hillary's "wiping"  of her server.  Specifically,  did she clean the server after the House subpoena was presented?  If so,  we are talking about a criminal act,  and that might be the reason for Pagliano taking the Fifth.