It makes absolutely no differance what so ever. Do a search on the subject and you will find more than enough to dispell the myth.

Lining up the blades with the fletchings does not actually get them to fly through the same air.

If you think about it for a minute you would have to be a mathmatical genius to actually figure out all of the variables in arrow flight to get the vanes and fletchings to fly through the same air. And at the instant one of those variables changes your efforts would be for nothing.

Some of the variables would include......... arrow speed, wind speed, wind direction, arrow rotation speed, density of the air, altitude, temperature.... the list goes on and on.