Can a betta be a doubletail AND crowntail?

ILOVEBETTAS

It's Cory Lover's cat!
My betta is a cull from a crowntail breeder. His tail is like a crowntail's tail, just not as ridged. But he appears to be a doubletail too... is this really possible?
 
Cuz he's one that didn't come out like the breeders had wanted. They're still the same breed but... I guess it's just a harmless birth defect or something...
 
In answer to your first question, yes, you can have DT crowntail bettas. DT is just having two lobes, CT is a fin type.
Being that he is a cull, he probably doesn't have a DT but rather has a split tail (misgrown anal fin) that makes it appear to be a DT. Having a split tail would be a culling fault in a breeding program.

That being said, without seeing a picture i couldn't say for sure.

As for why breed culls, it really depends on if the fish was a fault-cull or just an unwanted fish.

For instance, I'll call any fish that I can't/won't use in my breeding program a cull. These include some rather lovely fish. Particularily I have a BF line that throws opaques. I don't breed opaques, so they are culled from my breeding program. Generally I sell them off as pet fish to various people on the cheap. I don't destroy fish unless they have serious problems, such as a deformed spine, etc. Color washes (blue irridesance in a red fish) are another common reason to cull fish from a breeding line.
 
Oh now I know why he's a cull... he's a crowntail cull and a DT cull and his color's possibly cull-ish too. he's blue with red splotches on his fins. but i luv him all the same.
 
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