Rough idle turned to crank then ka-thunk

Demonracer said
In picture #6 with the welding on the tip of the rotor, I see black stuff on the top of the rotor. It could be a smudge, but it also may have tried to arc back to the distributor shaft.
Click to expand...
On the blue any darkness is grease but the tip itself did have some carbon build up evenly across the tip but no sign of arcing on the contactor