I feel like the Meteor blaze should be changed into a tier ultimate. While making a new fire ultimate in the future to compensate. Why? More FF flexibility. A falling rock is not necessarily all fire part of it should physically hurt.
MB would do 50% fire and 50%crushing damage. One side may hit harder dependent on the build choice. It wouldn't be weaker because it will be slightly buffed. Say like 60crushing with chance to crit 30fire on crushing build and flat 70fire 30crushing on fire build