Great photo, hate to see a saguaro go down! As a property claims adjuster (now retired) I saw the results of lightning striking a fir tree, travel in a spiral down the trunk and followed the root that had grown against the concrete walls of a home. It blew out the wall and every circuit inside the home. As I recall, the damage was in the vicinity of $16,000, in the 1970's. I have a lot of respect for lightening.
I don't know much about them. Are those it's limbs on the ground in the radial pattern or is that a root system that got pushed up and exposed due to the strike? I don't see indications of a root structure like that in the ones nearby so I'm guessing it's just the above ground parts now lying on the ground.