You may very well be right. it makes sense. However I'm pretty sure that the pic you posted, regardless of it's high detail, is a painting. not a photo. A good painting, but a painting nonetheless. If it is a photo, it's been doctored beyond belief, unnecessarily so.
Heck! With the way John is gripping the hilt in the last set of pics I posted, that knurling could probably do a number on any part of his hand...