I don't about physics but CDI is just following the best rigging practice. Toggles are better than no toggles. They minimize side loading fatigue at the terminal ends. If you want the best setup use toggles on all your standing wire. **************Biggest Grammy Award surprises of all time on AOL Music. (http://music.aol.com/grammys/pictures/never-won-a-grammy?NCID=aolcmp00300000... 48)