It could be any one of those choices,I have never seen that before.I'm not very familiar with aro's but is this caused by an injury, poor living conditions or is it just genetic?
I have also seen a vid with crooked snakehead.I have seen fish like that being sold like that. It's was on youtube. It was a tour of some asain fish shops. There was a tank for fish just like that I believe they were channa micro.and a few others If I can remember right. I'll see if I can find the video again