As I understand the rough chronology, she was given a quick burial, then the story about the sunroof handle was pushed, then someone else in the government promised to allow the body to be exhumed if the party asks for it. I’m guessing that someone knows that an exhumed body will clearly show bullet wounds, and everyone will be watching real closely. Someone thinks it is better to say so now rather than wait for a possible exhumation.
I think that’s at least one way of explaining it.
-—in the government promised to allow the body to be exhumed if the party asks for it-—
I saw that earlier and it struck me! Wouldn’t it be a cause of major public unrest to disturb the body? I wondered why they would make that offer unless it was so that people would say, “Oh no! That won’t be necessary. We’ll accept your explanation, even if we don’t believe it.”
A couple of points of fact.
First, there were large segments of time where the government wasn't in control of the casket containing Bhutto.
Second, I believe the body is in an above ground mausoleum and is easily accessible for further investigation.