Jerry, you can feather the tip into a very nice single bevel. I am holding one right now (Magnus that I reground) It can be made into a single bevel, just not exactly perfect like the Grizzly. Since the blade continually gets wider, that slight feathered area should make no real difference, I think. Course..I don't know if that is what Zwickey did or not.
Whether or not any of it matters at all is up to each individual. I already have enough No Mercy heads (the two bevel kind) that I really won't be needing any more for a while...not to mention all the other heads I have laying around.
I actually wonder why there is not a rush on right wing feathers so that they can just use the Grizzly heads as they are ?
ChuckC