Colby Rasmus has proven he has MLB power. Not mlb defense or On base ability, but he has shown he can hit homeruns.
Kozma has shown he has power in the MLB as well. Also, the roof was open in Arizona on top of the fact that air is really thin and that Phoenix has 2nd highest elevation of any MLB park. Pick a homerun that doesn't have stadium and location factor that favors my argument please. At least that way you won't look like a complete fool