So as suggested, I gave it a slight damp wipe to enhance the grain.
http://i.imgur.com/c1rhhpJ.jpg
http://i.imgur.com/i06rAZ1.jpg
Looks to me like the cap continues to the edge based on the continuing grain lines - just that there's a rather major change in colour.
Makes me wonder what that will look like with stain on it. Might affect what stain/darkness I use.