I think what they meant by "pet status" was that because the pied is recessive, the potential for creating pied combos is much less than the potential for firefly combos would be. No one is saying the pieds aren't worth anything, just that they're more difficult, per se, to get results with.
That being said, id go for the firefly myself. I'm not a huge fan of pied and pied combos but I love fire combos.
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