Well the fact is that we don't know, and we should not assume that he did.
If Schiavo is not afraid of an autopsy, why does he insist on a cremation, which is contrary to her parents' wishes and THEIR church? Did Schiavo cremate his mother back in 1997?
Is it contrary to their church? I know it used to be, but I've heard of some Catholics choosing cremation recently. In any case, if you think that the body will not be autopsied because it is to be cremated, you are wrong. There's no connection; it's a non-sequitur. Cremation can happen fast, yes, but it doesn't necessarily follow that there would not be an autopsy.