Hey, @weirdheadaches.
One of the sites I was looking at to buy the pizza stone had reviews where the stone had cracked, and so they gave it bad reviews. Well, then there were a bunch of good reviews that were basically saying if you heat up the stone with the grill, it won't crack. Another review mentioned adding the oil. So, I did both, and no cracks. :)
Otherwise, I wouldn't have known any better, and I probably would have preferred to prepare the pizza on the stone and then add both to the heated grill.
Can remember exactly how i did it :/. But i was cooking wings.
I think i did what you say dont do.
Maybe another go? Heat w grill & oil, hmmm....
Ty Glen