This is the correct height/size for the sprite according to the game sizes. In the game Bebop is taller/bigger than Rocksteady. According to the official website Bebop is 5' 4" and Rocksteady is 6' 8". So the game designers messed up.
Height/Size comparison:
I also cropped Don's wait stance more so that there is less space between Don and the Foottechs in your sig. Try this one in your sig:
