Awesome theory its starting to make my head turn to the snape is good theory but I always assumed that Snape would do some explaining to Harry before he died or something like that. Also the part about a third party was interesting, i'd never thought of it being like that before, your right your bachelors of english was in no way earned in vain lol im actually doing a bachelors in english lit now
But I do reckon snape is slightly redeemed in the 7th book or he'll be worse cos whenever JKRowling talked about Snape in interviews she always dislikes him saying how horrible it would be for snape to be in love and for us to keep an eye on old severus snape for we like him too much.
But I always assumed that the prophecy was all about choice, Voldemort chose to mark harry, none of the strife between harry and LV would have happened if he had never heard about the prophecy or took it so that it had to happen.