Do you believe every single EO, without exception, is "Outside the Church?" Why or why not?
Yes, absolutely. This is and always has been the teaching of the Church.
Now, is it possible that there's a PUTATIVE EO somewhere who is so befuddled in mind and so ignorant, knowing only the most basic rudiments of the faith, that he still retains the formal motive of faith? Possibly. BUT, in that case he'd actually be a Catholic, formally speaking, even if materially EO, or rather, appearing to be EO. His state would be similar to that of an infant baptized EO. If he died, say, at the age of 3, he would saved ... but as a Catholic. Starting at around the age of reason, the formal motive of faith gradually wanes. But I assume there could be someone so ignorant and confused that he retains this formal motive.
Here's the dogma: only Catholics can be saved. Period. No exceptions. If anyone at all has ever been saved, it's because he was a Catholic.