^^^ Yep that's right. To get more aerodynamic your elbows need to be able to drop down (or put hands down on drops, or both). Any time your palms are oriented vertically, as when gripping bar ends, your elbows can drop down. But your hands and elbows are still pretty far apart with bar ends on the ends of the bars. With bar ends inboard of the grips, your elbows and hands can be about shoulder-width apart while allowing the elbows to drop down as you get into a more aero position.