You make an interesting point. Let's examine your theory thoroughly
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Of course I am not talking about DD dying or the fight between the DA and DE, i mean how Snape just comes out with it. I expected a fuller explanation of the whole thing
Yes I too expected a fuller explanation of the whole thing. I was waiting for that chapter long explanation that Dumbledore gives in every book. Most unfortunately though, it was impossible for book 6. Then again, a fuller explaination would not fit into what was happening. You see, at the time, Snape is running away from Hogwarts and Harry is trying to catch up to him. Do you honestly think Snape is just going to stop in his tracks and give Harry a whole detailed story?

Of course not! That would be like Harry telling Voldemort a funny, joyful story in the graveyard scene of Goblet of Fire!
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I mean JK kept that story line going throughout, heck, the book is named after him!
I agree but you know what? That's just how Rowling "rolls"
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I know that Hermione figures out Snape's mother, I don't understand the significance to that either.
I think there is INCREDIBLE significance in this

. I read a theory that showed the similarities between Madam Pince and Eileen Prince; the one letter difference, the "hook-nosed" description of Madam Pince in book 6, I mean the signs are all there! The person believed that Snape was perhaps protecting his mother from Voldemort by employing her at Hogwarts and changing her name.