Unstoppable always had a damage component and it has always been able to clip other stuff even in dps role where its not a tank immunity, plus damage tick's range is quite small making it a melee/point black power. Its one special thing that Earth has, let it be! Who is to say that Crystal and Fury have to be the same? Are all of Earth and Sorcery's powers and SCs identical ? Crystal's extra damage is compensating for some of Sorcery's normal powers and namely Grand Summoning SC being stronger. Except that this extra clip was something Brick tanking terribly needed. Offering being able to clip in healer role could have been useful as well , not as crucial though.