I know stats aren't everything, but man that's a difficult argument to justify. I've always been a fan of Kennedy though.
Most would agree that Charnz had a poor this year, but here are the stats (per game, not total as Kennedy played way more games than Charnz)
Tries - Charnz
Try assists - Even
Missed tackles - Charnz (less than Kennedy)
Like breaks - Charnz
Line break assists - Kennedy
Errors - Charnz - (less than Kennedy)
Meters gained - Charnz (almost double Kennedy)
Offloads - Charnz
That's only for this year, but yeah not even close despite Charnz being quite poor