Ike shouldn't have a projectile, it's untrue to Fire Emblem games. I believe when he went up a class, he never learned to use bows either. So no projectile for Ike.
... If he had a good one he might be quite a bit better at some match ups, such as vs. DK. DK's reach and power can put Ike at some disadvantages, but with a projectile, he can force DK to approach; which means DK's screwed, his best and only reliable approach is the predictable B-air.