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The best way to put it is like this. You have a choice between Swampfire and Wildvine. Superficially, they're very different, and that difference translates especially well to toys. But narratively, the only difference between the two is the fact that swampfire possesses limited pyrokinesis. So if you sacrifice Swampfire for Wildvine, you not only make room for Wildvine but you can also use Heatblast now that the job of pyrokinetic alien is empty. Which then translates to more toy sales by extent.
Jetray, whose only real trait is that he flies fast, is damned to compete with Stinkfly, Astrodactyl, Big Chill, Lodestar, Fasttrack, and XLR8. So why keep him around if you have access to all those other aliens by cutting him loose?
