That's evidence, but it's not proof. But then, it's up to us to decide for ourselves what we believe, isn't it?Just a little quibble - that 6th Ed document was a legitimate leak, albeit one that was probably a very early playtest. The biggest proof of this being the few bits that came through to the final ruleset almost unscathed (Precision Shots come to mind), but you can also detect the same particular approach to game design being used, such as grafting new systems onto the old ones.