If the outlet is smaller, the current pushes it closed, unless it's rigid, in which case all the current getting pushed to the outside isn't being redirected in the opposite direction as you said. Instead, that current is just being directed aside, which does cause drag. Taking that design out to the logical conclusion, you end up with a drogue, as also mentioned on that page.
Note that a rigid design also has other constraints (storage) that may make it less desirable even if it is more efficient.
Note that a rigid design also has other constraints (storage) that may make it less desirable even if it is more efficient.