Enchi is more of a colour than pattern mutation. Not all of them are banded, but I'm pretty sure the first one Sweball proved was so that's what people expect in the mutation (not to mention it complements it quite well). I've actually seen a really smoking enchi female Loxahatchee Herp Hatchery had with an almost full back stripe and no banding at all. I wouldn't be surprised if that one starts to look like a low-grade enchi when it gets older based on its current colouration.