Not much. They would have been better just pushing the body over the cliff. If the suitcase is found that I still definitely murder whereas if the body was found more chance of accidental death.
I avoided this thread because I didn't watch episode 6 until tonight. Shades of the utterly brilliant 'Mad Men'. The air in the suitcase has kept him alive. Roll on Series 2!!
They don't want the body found at all! Hence the suitcase. She's already identified another body as her husband, so that she can get her sticky mitts on the insurance money. They should have undone the zips a wee bit to allow water in.