War designed to fit a theory, as the Bush administration learned last week, can falter when key assumptions don't pan out. After months of selling its case, the Administration gave the impression it had devised a Teflon war: quick, easy, relatively bloodless. War boosters predicted that Iraq's leadership would snap, Iraqi forces would surrender, Iraqi citizens would welcome American soldiers with open arms. Now that the first week's fighting has sometimes failed to match those expectations, some experts are asserting that the U.S. was not prepared for some of the possible difficulties. By JOHANNA MCGEARY Sunday, Mar. 30, 2003 THERE...