You cannot just say someone has a quality that they don’t. Newt may have done a good job managing things in the House, but by no generally accepted definition does he have Executive experience. I don’t believe he is claiming he does. Officially Milt is the only one with Executive experience of the 4 candidates. Private Sector and Governmental.
No one is, unless you lying about Gingrich being a lobbyist falls under that.
The history making radical leader, Newt Gingrich, did not "manage" the Republican house, he created it, and then was it's Executive Warrior Chieftain, the leader of the right, and the only opposition to the Clinton 1990s, the warrior who took over the Reagan torch.
Romney was in a defined executive position in government, and he failed dismally, he clearly has no political leadership/executive skills, something that Gingrich will go down in the history books for having in spades.
Your attempts to glorify Mitt Romney as the true and only "executive" primary candidate is a failure.