Richard,
Thought the same about McLaren...sooooo easy to write a car off up there.
Not taking anything away from Button, but I would doubt he could be as quick as CL in the V8...big, heavy car on a circuit that is not easy to learn...local knowledge and lots of track time counts so much there.
I wouldn't be at all surprised if we see Button compete in a Bathurst 1000 in years to come though