Replacing my Intake Manifold Question

It's been a while........Since water seeks it's own level, wouldn't disconnecting the lower rad hose effectively allow the coolant to drop to the coolant passage level between the timing cover and the block? These passages are below the passages in the head so it shouldn't affect pulling the intake. Am I off base?

The OP just wants the coolant low enough as not to flood the engine when the manifold is removed, not drain all of the coolant.