The key to understanding Newt Gingrich is that he positioned himself as the leader of conservative Republicans in the House, used the House Republican Study Committee (HRSC) as his vehicle for years to advance himself, and then, when he became Speaker, changed the rules to destroy the House Republican Study Committee.
He used the HRSC as a ladder to the top and then removed the ladder to eliminate its use as a check on him. Whatever his talents and his faults, for Newt it's always about Newt.
After Newt, the House Republican Study Committee came back, stronger than ever. If he ever became President, it's an open question as to whether or not the Republican Party ever could come back.