This argument doesn't work. If you're trying to assert that the entire player base got better during the period between the release of the 11c and the Tanto, the KDR/KPH/etc. numbers would not go up, because the entire player base has gotten better. Ir you're trying to assert that only some players got better during that gap, you'd also have to assert that that group disproportionately use the Tanto. There's no way to prove that, and no evidence to suggest that that would be the case. But even if it were, it would be surprising that the more skilled players disproportionately choose to use the Tanto, if it were such a bad gun.