These same arguments has been around for eons. If I remeber correctly Tom Kaye (AGD President) even went as far as performing controlled testing using high speed film and concluded that there was NO difference in accuracy between open and closed bolt markers, the same thing was done over at warpig.com (still in the tech section).
To say they are more stable in your hands is also a fallacy as the cocker has a back block slamming back and forth as you fire
Thundercat, you are switching what I am talking about - Skeet said that an Angel somehow distorted the ball in the breech and the cocker didn't - I asked how this was possible.
If you want to talk consistency instead then this is as much a bi-product of the air source as the marker and again, I don't believe the latest e-blade cocker (Nexus signature say) is any more consistant than the latest Angel (A4).
I am afraid that we are still at the point when nobody is able to explain how a cocker is more supposedly more accurate than an Angel or any other marker given the same paint/barrel and air source variables.