A. they're pirate form seemed to be plenty powerful considering their infinite ammo pistols that shot exploding bullets that seemed to be as effective as a grenade launcher.
B. for whatever reason they decide to morph forms even though they were raping all face as pirates, so what do they morph to?? well I'm pretty sure I heard ninja, which would make sense considering if pirates couldn't handle it ninjas should be able to do the job, so the ninja's ultimate weapon is a rugby/football weapon that morphs into a garbage truck that ghostbuster sucks them into the back and then drives away...
C. then they morph two more times for what I don't know why only to be reverted back to their original pirate form for the final fight...which I didn't think they needed to change away from to begin with