Yeah for me, if a being is truly all knowing, there are no possibilities - only what is going to happen.

I think a lot of it depends on people's definition of free will.

For me, if there has to be an actual choice possible. Meaning that there has to actually be multiple possiblities being true. If something truly knows everything, then there really isn't a possibility of any deviation.

It's a discussion that I agree that it will be hard to convince people of either side on :)