so, another devils advocate...
how many athletes need to change before you can say its a different team all together competing for the first time? or if you don' bring your Sr2 team to dallas but have your Sr3 compete in 2.
or at a local cheap regional with free cross overs- cross over the whole team to whatever other level.
or Sandbag the comp before Dallas too and play it as getting the lower level routine down before going to Nationals.
I think its a great rule! I couldn't imagine trying to adjust our Sr 3 routine to a level 2 routine, sure the tumbling is no biggie, but the stunts would have to just be a completely different stunt and our pyramid isn't even remotely legal at 3, I think the Preps are the only element that are legal at 2.
Just pick the right level and stick with it!