If you had 10 heavy air regattas and no light air regattas the light crews would soon say I don't have a chance to win why even go.
We had Matt Mc and Bart sailing at 125 kg = 275 lbs at the F16 Global challenge in pretty darn rought conditions. Think 18 knots minimal windspeed with gusts to 25 knots and confused seas with a 2 meter swell and a sizeably windchop on top of that.
They did extremely well among all the other 2-up crews that were indeed heavier in combined crew weight. Lots of 1st and 2nd's.
There are enough examples of the reverse being true as well 1.e. heavies doing well in light stuff.
I understand that the gut says otherwise but it really wouldn't be the first time that the guts are wrong. An example, 6 years ago not a soul in the USA believed that a 16 foot catamaran design with a small sail plan could even dream of being near to a fully blown F18 in racing. Now guys like Nigel Pitt and Olli Jason are taking test rides on the Blade and scoring 1st in light air on their first time out.
Sometimes things are simply not the way they appear to be.
Wouter