#2 Does not explain a cause for items of all weights (yes, all) to trend movement in a downwards direction. In the case of a helium balloon, it will also fall without a more dense medium for it to float upon (in a vacuum chamber, for example), which proves it also will trend in a downwards movement unless stronger forces buoy it up. Stating that "heavy things fall" is an observation, but not a description of cause. An explanation for why matter tends to reorder itself in order of density/weight is needed.