Why *didn't* Dumbledore fill DADA post? (Re: Potion Master...)

[Hagrid]

No: HPFGUIDX 83452

--- "Jen Reese" <stevejjen> wrote: (snipped)
> If Snape could teach DADA, why didn't DD move him over for  
> the year and look for a temporary Potions teacher so that 
> Umbridge wasn't appointed? Maybe I'm assuming too much to 
> say another Potions Master is readily available. 
> 
> Unless Dumbledore wanted a Ministry offical at Hogwarts. 
> 
> Sure, it could be a plot device, to bring in Umbridge 
> to depict the tensions between Hogwarts and the MOM 

If Snape left Potions, then Umbridge would have taught that class by 
getting the class to read from chapter one ..."-and don't bother 
about bringing those cauldrons thingys," she'd say. "The smell of 
potions brewing makes me come out in hives, so we will just read."

Any good wizard or witch trusted by DD for DADA would be busy in the 
Order. The only exception was Sirius Black. He would have been great, 
if not for the fact that every Auror and dementor in the country was 
after him. 

Heck, Dobby would be preferable to Umbridge.