Has this been done before?

Probably, but I haven't seen it.. so here goes! I had the DADA teachers on my mind. I am also trying to find anything Snape said to Harry about Harry's father. (didn't find anything in bk 1)..

BUT.. I ran across the riddle that Snape wrote. Out of context, it fit with what we could know of the DADA teachers thus far. I have not analyzed the whole thing, to try to make the end pieces fit together, but I will.

Now,Prefect Marcus (a.k.a. Mark B. Hammer) at the Lexicon has gone to the trouble to figure out the solutions, which fit with my theory, mostly.. and while it doesn't portray Snape as favorably as I hoped, it is ok..
http://www.hp-lexicon.org/essays/essay-potionriddle.html

Here goes:
*Danger lies before you, while safety lies behind.
*Two of us will help you, whichever you would find. (Two DADA teachers will see him through)
*One amongst us seven will let you move ahead,
*Another will transport the drinker back instead. (One of the two will help to learn what is needed to move fwd and defeat V, the other, though supportive and a friend, would help H stay safe and go back)
*Two among our number, hold only nettle wine. (Lockhart and Snape)
*Three of us are killers, waiting hidden in line. (Quirrell, Moody and Umridge)
*Choose, unless you wish to stay here forever more. (Can't stay neutral.. what'll it be?)
*To help you in your choice, we give you these clues four:
*First however slyly the poison tries to hide
*You will always find some on nettle wine's left side;
*Second, different are those who stand at either end
*But if you would move onward neither is your friend;
*Third as you see clearly, all are different size,
*Neither dwarf nor giant holds death in their insides;
*Fourth, the second left and the second right
*Are twins once you taste them, though different at first sight.

Lexicon's answers:
P W f/p f/p P W B
My application:
Q L L M U S ?

Neither Lockhart nor Severus tried to hurt Harry, which fits with second left and second right.
Lockhart and Snape are alike, although not at first sight. Well, they look like total opposites, but in the end, Snape is just as arrogant and full of self as Lockhart. They just apply it differently.

And I like the ambiguity of #3 &4 helping or hurting Harry. MoodyCrouch helped Harry a LOT! His goal was Harry's ultimate demise, but he did help him. Lupin did not have Harry's ultimate demise as his goal, but when Lupin was transformed, he did try to hurt Harry.. so that is pretty accurate!

The seventh DADA teacher will be supportive to Harry. I was thinking he/she would hold him back, but hubby has wisely said to not lock myself into that mindset. Perhaps he/she will help Harry get back to normal, or bring him back... from whatever he needs brought back from.

Will there be a new character for the DADA teacher? Until Snape, they were all new to us. Hmm.. maybe Bill Weasely? I like that one. Maybe that will be my prediction for bk7.....

I still contend that Snape will protect Harry in some fashion from the DADA teacher.