What did the IA caucus tell us?

So the IA caucus was a virtual tie between Clinton and Sanders, Clinton with a slight edge. Plus Clinton won 6 precincts via a coin toss! (What are the odds of 6 in a row?) So 1) 538 was wrong that she would win and 2) now they're saying it was bad news for Sanders? The Clinton establishment is spinning that same story, while just about everyone else sees this as a major accomplishment for the Sanders campaign.