If bars are properly setup then drops may not be as fast as hoods. Forearms parallel to ground with hands on hoods *should* have the back in the same position as hands on the drops and a little less arm in the wind.

You can also get very aero with forearms on the top of the bars. Definitely not for in the pack.

The more power you put out the lower you can put your bars, the less weight is on the bars. IMO - most that copy an aggressive racing position do not have the power to take the weight off their hands.