1.It's a mistake for Alissa and Jeremy competing in Europe 2 weeks before Worlds. I believe it was the coaches's decision, not USFS. Coach should be the one to be blamed. If they wanted to do it to gain confidence, that's another story, but it did not look that way. By the time they get home after poor performance, it's very difficult to build up their confidence or make any correction in jump technique or program due to time constraint. The anxiety will build up causing more negative thought than anything. It was coach's poor judgement, IMO.
2. To stay in Europe for two weeks and practice before Worlds is very expensive. Besides food, lodging,transportation, athlete also has to take care of some of the expense, e.g.coach's daily fee (since coach will lose some income during those two weeks when compare with staying at home).
3. It's not easy to find ice time to practice if you're not familiar with the town/city.