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There doesn't seem to be any resemblance of even pressure between the flywheel, the clutch disk and the pressure plate. The transmission side of the disk appears to be applying pressure to the inner portion of the disk, while the engine side of the disk appears to be contacting the flywheel only in a small portion of the outer part of the disk. Seems as though the clutch disk was warped.
The purple on the very inner portion of the clutch disk spring plate doesn't appear to be heat related.
I'm imagining some very serious harmonic disturbances were created by this set-up that ultimately sheared the flywheel bolts.
The flywheel should only be $25-40 to resurface, then I would dispose of all the other parts and start anew. Upgrade to a stock pressure plate and clutch disk until you decide to create serious power. After that you would be going to a lightened flywheel anyway.
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