I am so sorry that you didn't have the greatest experience with our All American process! :( Personally, I am not a fan of nominating for tumbling, only because I've seen too many girls not ready to throw skills try to throw it solely to be nominated. It can get to be a little scary at times.
We nominate in 6 areas: stunting, dance, motion, jumps, tumbling, and leadership, so we do have times when athletes are nominated for All American without any tumbling, and can even make the All American team without tumbling! I'm so sorry that your seniors were not nominated even after you expressed their interest. If you would like to, please send me a PM to tell me more, and I can put you through the proper channels to voice your opinion to someone higher up!
ETA: I am not a speed staffer, I am a traditional camp staffer so that's how our nominations work at a traditional or performance camp. I took a few minutes to try and find if there are any differences between our tryout and speed's. Unfortunately there are differences. The speed tryout mirrors the collegiate All American tryout more so than traditional tryout. Here is a link to read more about it!
http://nca.s3.varsity.com.s3.amazonaws.com/Files/Camps/speed_camp_all_american_process.pdf
NCA All-American