I have yet to see our new pack in action - not long though until the Harlequins game. However, it's not just about weight. It's also about presence and what you do with it.

Correct. Also, an 18 stone fat lad is always going to lose against a 16.5 stone muscle bound athlete.
Furthemore, don't be fooled by the stats. There's about a hundred reasons why the could be wrong. Far from scientific.