Don't the decepticons know about all the other races floating around the galaxy? Like, oh I don't know, the ones who built them? Or the ones who helped the autobots win? Is skullcruncher just really uneducated>
Or the ones that have SKULLS that he can CRUNCH and thus get his stupid NAME. I just think, you know, he was having a laugh kind of trolling the other decepticons. It was probably a long, boring space flight.