Body Boost

Figured as much, but I'm thinking that if there are 3 BaMs in a party and each of them are using different auras...Body Boost will boost all three auras on each BaM, right?

No Body Boost only works on the active aura you have casted. I was in a party with my one friend and she had Dark Aura on, I had Yellow Aura on and when I used Body Boost it was yellow but my attack range didn't go up. Suffice to say they made sure that wasn't an option.