Flitwick as DADA professor?

[potioncat]

No: HPFGUIDX 90979

Fred writes:
 As far as I 
> remember, Flitwick did not even grade the test, he just collected 
> them. To me, and this is just my opinion, this makes him their 
> supervisor during the exam.
> 

I was surprised to see Flitwick in the memory as well.  But my 
feeling was that he would have been a member of the MoM team who 
came to test the students. What I wondered was, when did he become a 
faculty member at Hogwarts? We didn't find out when Umbridge was 
there because she visited Charms when Harry wasn't in his class. Did 
he sign on after Snape?  Would that explain why Snape seems to be 
senior to Flitwick and Sprout? We didn't find out when she began 
teaching either.
By the way, after Minerva was sent to St. Mungos, did Umbridge 
appoint a deputy?
Potioncat (who still isn't convinced Snape wants DADA, but who has 
an open mind)

"potioncat"