May depend on where you fly.

In the US, the current rules basically outlaw team flying or ground info.
Worlds, from what I gather, may be incorrect, seem to favor coordinated team pilots and ground info.
Thus, the US is already a step or so back. Not saying a good pilot can't do well, but they're starting off sorta in the hole. A couple days or so practice in a new environment is not great. Look at US sports teams that do their showcase "best of this sport" game. While they may do well with their team, they tend to suck in one game since they have not worked together.