yes, all the best crews were there
basically this was the general proble before the Olympics (even if they have a global qualification regatta yet to come, if I remember well...but most of the Olympic participants are already there, so, not their task)
the main difference between this championship and the Olympics will be the weather/wind...in Marseille the situation is quite different from Lanzarote (which is at the Islas Canarias), so, the outcome might be different, too (btw, I don't think that will miss out on a medal, at least among the women...they're too good)