Non segwit minority miners must still build on top of the longest chain that the rest of the network considers valid. Do you agree or disagree?
Yes, I agree. What are you trying to argue?
All of your arguments are in the context of segwit = majority. Because non segwit minority build on top of the longest chain, there is no longer an issue of different spent/unspent TXO.
But if segwit is the minority and non-segwit is the majority, it is different, hence my original point in this thread.