if you go 3-1 in a week, you will not drop under most circumstances.
And you shouldn't.
it's all relative. yes, under most circumstances, you shouldn't. however, if you've got a team sweeping series behind you and another only winning 2/3, the win/loss differential expands each week. for instance, the week before last, vandy went 2-2 on the week and dropped one spot in baseball america, falling to #3. if we had dropped a midweek game to some scrub team like they did and a weekend game to a florida team with a losing record, do you really think we'd have been afforded the same "courtesy"?