There's a rumor about poor glue jobs from the team Sky mechanics. Maybe old glue or something. Apparently the glue job failed on the wheel that shattered before it broke, after the tire came off the wheel hit the pavement and then exploded. Two more bikes had tires come loose and cause damage to the rims.
Digression but still based on the Sky team - why did one of them have the chamois pulled up way above his belt line?
This is a Castelli quality control or fitment problem and it's far more common then you might imagine.
Companies like Hincapie used to be known for this, sewing in pads wherever the hell they please.
You would think there's a jig or something so make sure they're set correctly front to back every time, but no, seems that's not the case in most all places, seems they just stitch them in "close enough" to where they're supposed to go.
With Shimano technology this advanced, simple classical physics is not relevant. Rather than the wheels themselves breaking, it was the space-time around them that fractured. There are an infinite number of parallel universes in which the wheels continue and Skye wins the TTT. We just happen to be in one of the infinite number in which they didn't.