It makes sense, dummy characters were characters that may have had an original usage or a character that would be playable... but after time they decide that they don't want the character but still keep the data...

BUT Anna and Golbez are used... Anna appears when Edward fights the BushHag... and Golbez fights CPU-controlled at the end... they aren't dummies... they are playable and can be used, but it's likely that everything will mess up if you use them..