I still don't think you can say that 100% categorically.

All you can say is that the ignition values are higher than the conservative ones others might use and that it is "possible" that following the damage done by the FPR coming off, that they contributed to a catastrophic failure that "might" have not happened on a completely healthy engine.

The ONLY way to be sure would be to build an engine to the exact spec this one was and properly det check it in the car at somewhere like Bruntingthorpe.

Anything else is best guess speculation. And a wise tuner always said to me: TEST don't GUESS.....