What did we learn from a chaotic EU summit on Brexit?

After a chaotic 48 hours and more than a little political ducking and diving, next week's looming Brexit cliff edge has been pushed back - much to the relief of people who are in the direct firing line if it all goes wrong.
It is understandable then that, this weekend, EU leaders and British prime minister Theresa May will be trying to convince everyone all is right once again with the world.