1. To me this thread is all about determining if and when a stunt changes into a pyramid and is similar to the thread about the difference between standing and running tumbling (
http://forum.fierceboard.com/threads/level-2-standing-running-tumbling-pass.18978/). We have to figure when one changes to the other. For stunts and pyramids I say the pyramid begins with the connection. The connection can temporarily break then reconnect and the skills done during the break are still part of the pyramid, but the pyramid doesn't start until there is a connection.
2. I think we're on the same page regarding this. There should be building rules, instead of stunt and pyramid rules, which allow some additional things with bracers. (I also think standing and running tumbling should be combined into tumbling, just like L5).
3. This happens in L1 often. A team does prep level libs while holding on to an extra person standing on the ground and it changes a stunt into a pyramid. Holding on to that extra person is the difference between legal and illegal.
4. You lost me on the Senior Elite reference, but I believe the concept is correct.