I think it's pretty clear. You're wrong. Going from SPX.
Said I wasn't going to respond, but one more time. Saying I'm wrong with no proof other than a cut and paste that doesn't answer any questions raised and no explanation on your part of any issues or points made is completely worthless.
On the SPX issue you may be talking about a SPX Flex trade, not sure as you don't seem to want to discuss anything, respond to any points.
Specific questions
Do you claim that off exchange trades in equites can be guaranteed by the OCC and are fungible across exchanges, including the likes of SPY which was originally raised the OP? This seems completely opposite of what the OCC posts
"As mandated by the SEC, standardized U.S. equity options are to be executed solely on exchanges. All equity options in the U.S. are issued and cleared by OCC, and are interchangeable across options exchanges, except in the case of contracts that are licensed exclusively to one exchange"
Do you claim the upstairs, off exchange SPX trades will be guaranteed by the OCC, simply by reporting to them that the trade took place, that there would be no need to cross/execute the trade on the CBOE itself? If so would these trades be fungible to trade with another parties on the exchange. Not including on exchange Flex trades here.
If yes to these a explanation would be helpful. How would the OCC handle reporting requirements? It would open them up to potentially trillions in trades that would have to be guaranteed and monitored.