I my area I am often seeing and that are long and narrow and slightly round some have very pointy noses.  I saw a beautiful crown tail with a huge crown but he had this body type today in box store.  I was just curious as to the likely mix. 

CTs tend to be more streamlined than others.. you may be seeing younger bettas that haven't beefed up yet.  Straight toplines are favored among breeders and people who show bettas and they aim for it.. you may be seeing some better quality shipments. 

In pictures most of them look wider to me.  I think I might go get a picture of him to post.  To me it's bit odd which why I asked about it.  He does grab your attention nevertheless.  One of my fish that I got from there is similar but he has a rounded face.