I somewhat agree with MDZ.
Before the flames, let me explain. I'm talking about one button ownage. Examples: Mario with his wall of flames, Bowser with his huge invincible damage, Link (im assuming) guaranteed massive one-on-one damage. No one has said that the Yosh is invincible, so he can get beat the **** out of while he is doing it, no one has locked his targets (like link) so there is a possibility of doing no damage, especially since you have to control this amazing fire breath all the time, and his wings could give out at any moment (killing us over the edge)
Besides that, If they are going crazy turtle shell style, (super mario world) why aren't the fire balls in three, and more importantly, where is the stomp?! I don't think it would make him broken, in comparison to the other broken finals to give him a certain damage or hit when he jumps on the stage.