Roy, I actually had to read that 5 times to fully understand what your were saying (dosen’t help I’m working nights at the moment), very interesting stuff.
I guess you also think, if one valve hadn’t been seating well for a while then it is probably not the only one getting to your well described condition..
I am also guessing that its a 50/50 chance of the chip being blown out as it is falling back into the engine and destroying the cylinder lining?