“So how can an Arahant have vinnana?”
I can explain this only so many times. I have said so many times that an Arahant has “undefiled vinnana”. If you try to be a lawyer and not willing to understand Dhamma, there is not much I can do.
When the Buddha said, “I was born such and such a person” long time ago, he did not literally mean that. There is no “I” going from one birth to another. It is just continuing “lifestream” filled with suffering, that will end upon Parinibbana.
Somethings need to be just understood. There is simply no assigned special name for the vinnana of an Arahant. Those who understand what is meant by vinnana KNOW that vinnana of an Arahant is undefiled.
I will have no more comments on this issue.