All the Revolution kites are linked to each other directly. There are 5 lines on the LE and 2 on the TE. You can put as many as you want. The control is done with 2 bended handles like they have one buggy race kite.
Flexifoil have been doing this for ages, puting kite one after the other to add more power is an old concept used during the first world war with observation kites.
So in this case there is one pilot for all the kites.
The choregraphic side comes when there is one pilot per kite
All those kite festivals and competitions are big in Europe and North America.
You can also have indoor comps
Enjoy the few links