Board Thread:General Discussion/@comment-24839811-20161215205201/@comment-24546423-20161216133407

Some aliens may have same abilities but they are a package of different powers. E.g Both Bigchill and Ghost freak have intangibility but ghost freak has additional powers which big chill lacks and viceversa.

Some powers appear to be same but actually are not. E.g Brainstorm, Greymatter and jury rigg, all have distinct abilities; humungosaur is stronger than fourarms.

But yes, there are some aliens which share all their powers and abilities with other e.g Arcticguana with bigchill, eatle with upchuck, fastrack with xlr8 etc.

If you look at first apprearances in the show of such aliens you may get answers for some.

But ofcourse best explaination is that, there are many aliens out there in universe and its not surprising that many of them share their powers and abilities.