Here is an excerpt from Jacob Westers blog where he describes the deal in from his point of view:
"Understandably, this got boring after a while. In Vail, Colorado, at the US Open big air competition in 2006,
37 out of 40 runs in the qualifying round were switch 1080s. Something had to happen, and I’m going to blame
and thank
Mike Wilson for taking the first step towards a new age of big air
competitions. After landing two Wilson flips, or better described as “
underflip to switch rodeo 540“,
he didn’t make it into finals because the judges didn’t know what to
make of it, but he left a few questions hanging in the air. Was this the
way forward? Can we make this cool? Is this aerials?
Watching Wilson doing his thing while all of us were stuck in a rut
of just spinning like tops, Jon Olsson and I said to each other –
this is what we have to do.
I remember Jon ranting about how this was the future and we better get
on it now before everyone else. The rest is history. Jon went off to
Australia to invent the Kangaroo Flip on the water ramps, I worked on
double backflips in Åre (on the jump Jon built to learn Kangaroo on
snow, all props to him for pioneering, yes, he should get the credit for
doing the first “new school doubles”), and at the Jon Olsson
Invitational in 2006, on the first perfect big air jump to try double
corks/flats on, we unleashed the new tricks to the rest of the world,
Jon stomping Kangaroos and I figuring out
double cork 1080s and 1260s. All of a sudden these tricks were accepted by the judges, and we had something new and fun to play with."
http://www.freeride.se/jacobwester/2010/11/23/thoughts-on-style-and-its-royal-family/
I think this sorta clarifies that Wilson did double flips first but Jacob did the first true "double cork"?