I couldn't disagree more. If you have a slower rider behind you, you have no pressure. The ideal group riding experience level should be fastest to slowest with the second fastest guy first or last. Egos are going to make this impossible because everyone is faster in their own mind than they really are. Having a bunch of people riding together without much experience can only lead to more destruction not less. By the definition of inexperience they are less safe why would you want them to be up front? The next fastest rider in front of you usually can't suck you into riding over your head but a guy who should be way up front can. If the guy behind you is slower he can't pressure you. I am missing the aviation parallel here because that pressure is self imposed. Having a faster rider breathing down your neck is an immediate pressure. Put a faster rider behind you at the track and see how you react, you may not do anything wrong but it won't be a pleasant experience when you are using up some of your concentration worrying about holding them up.