If it was foam, then we have to see if it has the consistancy to damage these ceramic tiles if it is determined that the tiles failed over California. Until I hear otherwise, I'm guessing it was ice because it was white and it sprayed on impact. Was the foam white?
BTW, can you point me to ANY places in California where they are searching for debris?
If my guess is correct, it was only a few tiles that were lost over California. The odds are low of them being found out in the desert mountains.
That being said, if a few did fall off over California, the catastrophic events wouldn't have happened immediately and since it was traveling so fast, I still think the even happened over Texas.
BTW, I don't trust ANY of the pictures we've seen so far.