During the Summer 2015, 2020 is not for kids who just completed 7th it is for kids heading into 8th grade (not necessarily the same thing).

2020A - is for kids heading into 8th grade for the 1st time
2020AA - is for kids heading into 8th grade for the 2nd time

Crush entered the wrong division

Crabs is the best 2020AA team
Crush is the best 2020A team