A theory can be proved by experiment; but no path leads from experiment to the birth of a theory.
In the end, my reasons for moving down the timeline and introducing a new cast have more to do with keeping myself entertained, on the assumption that if I get bored, my readers are going to be even more bored.
The dance world is too small in lots of ways - it's too intense, it rattles around itself, and it needs exposing to other ideas.