So I understand this.

There are two things on an airplanes wing- there are wingtip vortices and there are downwash and upwashes. The Downwash and upwash creates an energized current of air which is helpful to the back geese. The wingtip vortices the geese avoid because they are in a V formation whith a large enough V for the vortices to not touch the back geese. BUT, should one geese fly right behind another- he will go in those vortices and there will be a negative effect on his flight efforts. Did I get that correct?