I love the creativity you can have at level 1. That skill sounds awesome - will need to look it up when I do my usual thing of subscribing just for two months of the year
I coach u-17 level 1 and we have a few crossovers to senior 3 (which is our highest level team - I'm in the UK and quite a small programme). The only kids on that senior 3 that can do a valdez are the ones who crossover to lower levels.
My opinion on this is always that it doesn't matter if a kid on a team can throw level 6 skills - they can still only do the skills allowed at the level they are competing in. Nothing says the back walkover of a level 6 athlete is better than that of a level 1 athlete. Sometimes a lower level team benefits from having kids on it who are a bit more experienced as it helps build confidence within the routine - for example having kids who you know you can rely on to remember the counts and know their place and also just help out others that may be struggling in class. I do think there should be a limit on how many teams someone can cross over to, and how many levels they can move across though. Just to have some kind of regulation in place for it and also to prevent burnout. Three or more routines is a lot.