Are you two sure of that ?
I mean , Snape still looks like a death eater since he killed Dumbledore in the sixth ,
and all of us wouldn't know the truth until the final one comes out .

Alright , I have to confess that I've always liked McGonagall much more than Snape ,
though the " Minerva is evil " theory is quite interesting and couldn't be impossible .
But we could thought that McGonagall 's just sometimes " moody " when she sobs .