Yeah, the big difference between a 51-49 and a 49-51 is the media narrative that arises, moreso than the tiny delegate difference. The big story here isn't that Bernie won Michigan. It's that he beat his polling average b a crazy amount. Even if he lost, beating the polling average by that much is good news for him. Having the "Sanders Resurgent" media narrative is just icing.
Honestly that's how it's supposed to work. That's how it should work, but media having their own agenda instead means that narrative will most likely be buried in an attempt to squash the momentum of sanders' campaign.