If you read the posts sequentially and follow along the sarcasm isn't nearly as difficult to ferret out as one might think. They even have handy little numbers to keep us from getting lost.
Semantics are fun!
I'll attempt to be a little helpful:
I have similarish w/kg as Ygduf. Lower, but not by too much (in some cases higher than his efforts at Patterson). I'm a 4 and I haven't yet cracked top 10 in a 4's race. I'm not trying to prove that 4's are hard and you need 5+w/kg to win; you don't. What I'm trying to say is, pure w/kg is great but doesn't come close to being the silver bullet for taking home a podium.
When I was racing 5's I was regularly in the top10 and I know I was slower then than I am now. Don't get caught up in magical numbers, just train weaknesses and go race. Results will come... maybe.