1 - It's not a courtroom, I don't have to come up with an entire list of clubs to justify my opinion, I just named two of the obvious choices.
2- Hypothetically speaking, If I thought Melbourne were light years ahead of us, I could still say "I don't think we have close to the best go forward in the competition". It doesn't mean we are right down the pecking order with many teams ahead of us, it means we have a long way to go before we are "the best". The gap between the best and the second best might be significant?!
You put the question out there, I just gave an opinion. Not sure how it doesn't make sense? You just don't agree with it, which is fine.
Effective go forward is not just about how many yards you make. For example, Aaron Woods averaged more metres than Taupau last year and the year before that. But...Aaron Woods' metres are slow, plodding metres that do not require a great threat to the opposition defensive line and do not attract as many defenders as someone like Martin Taupau for example. This doesn't show up in statistics.
When I think of go forward, I think of a team moving up the field smoothly as a unit, getting quick play the balls and moving the defence around. Penrith taught us a lesson in this in the second semi-final last year. They played the ball quicker, had better service from the ruck and everything happen quicker. I think there are a number of teams in the competition that get up the field quicker, smoother and more effectively than we do, regardless of AFB's post contact metres or Taupau's overall running metres per match.
If I have misunderstood what you were asking and it's strictly about players generating metres with no other variables considered then put me down for the Des Hasler school of thought that Aiden Tolman is the best prop in the game (this comment is very firmly tongue in cheek).