Since I first heard about FVEY, I have assumed that each of the member countries has total unrestricted access to 100% of the data that any of the other member countries have collected.

The more that we find out, the more I believe that that is an accurate assumption.

There's no way that the other 4 eyes have "100% unrestricted access to the data" of the big one...

Thats true, only Israel has that, as per recent revelations.

Israel doesn't have unrestricted access. The access is contingent on Israel promising not to use it to spy on us ;-)

You are probably right. Given the MOU with Israel, there are restrictions certainly for other governments.

Those restrictions include, presumably, that they agree that among eachother they promise not to read achothers' emails, and furthermore if they do this and use the information to spy on our government, they promise to do so discretely....