It's not always about who you have beaten. It's HOW you beat them.
Anderson got his shot at rich after his total destruction of Leben. Maia is undefeated has finished ever fight with spectacular submission victories. Maia is the ADCC Absolute champion and just beat Chael Sonnen Completey and utterly who beat Filho who everyone on the inside of Andersons camp says can beat Anderson.
Who else in the division do you feel deserves a shot more then Maia?