I'd like to make a comment on that accident... there's no way it happened under those circumstances.
I've autocrossed in the rain half a dozen times in that car. Mostly with the OEM tires. The rear end dosn't come around, not even under broken traction unless it was provoked. The ways to make the car rotate require hard acceleration followed by lifting or braking into corners, even then you can get back on the gas and the front end pulls through.
Running in standing water (1" on the back corners) with Kumho Ecsta V700s I could faithfully step out the rear end, but the car never 'drifted' and its virtually impossible to make happen under steady state speeds.
To make the rear end come out it would have to be at a much much higher speed or under heavy acceleration followed by lifting in the low traction condition. If they were the OEM tires on OEM alignment... just no way. Something really stupid must have been going on.
I don't know anybody involved in this incident... just from my experience with the car at the absolute limits during motorsports that just dosn't happen that way.