The DADA curse and Harry

[Eric Oppen]

I was sitting around thinking about the "curse" that's on the Defense 
Against The Dark Arts teacher's position, and it occurred to me:  Did Harry, 
in fact, avoid the curse?

While he wasn't an official teacher, he was teaching DADA, and doing so at 
Hogwarts.  I don't know exactly how magic works, but if he could be forced 
to compete in the Tri-Wizard Tournament even though there were three 
rightful champions, the DADA Instructors' Curse could have lit on him.

Let's recap what happened to the DADA professors we know about.

Quirrell: possessed by Vapormort and "left to die."
Lockhart: memories destroyed by a spell he tried to cast, a spell at which 
he was apparently quite expert.
Lupin: "outed" as a werewolf, nearly killed the Trio.
Moody: kidnapped and kept under Imperius by an impostor, who was, himself, 
Kissed by a Dementor.
Umbridge: kidnapped and (probably) abused by centaurs, after being promoted 
far beyond her abilities and driving the school     into a state close to 
open rebellion.
Snape: trapped by a stupid Unbreakable Vow into killing Dumbledore, forced 
to flee Hogwarts, "outed" as a Death Eater.

Not a very encouraging list, is it?  People in the fandom seem to think that 
Harry avoided the curse, because he wasn't ever the _official_ DADA 
instructor.  However, in his fifth year, Harry lost not only his romance 
with Cho Chang (which was probably doomed from the beginning; Cho was 
clearly still grieving over Cedric and casting around for a 
"Cedric-substitute") but his closest link to his dead parents, his 
godfather, Sirius Black.  To make it worse for Harry, Black's death could be 
laid at Harry's door---his refusal to practice his Occlumency left his mind 
open to Lord Voldemort, and that allowed Voldemort to plant the visions in 
his mind that led to the confrontation at the Ministry of Magic.

Also, in common with the other DADA teachers, Harry didn't return, at least 
not as a DADA teacher.  While he was at the school his sixth year, 
"Dumbledore's Army" was apparently dead.  Even though Harry had enjoyed 
teaching, and his students had learned a lot, he didn't teach again.

So-o-o...did Harry avoid the curse, or did it fall on him, too?