Question from the new girl

[ge25y]

No: HPFGUIDX 106033

Hi I'm Jennie and this is only my second post so forgive me if you've 
already discussed this.  I was poking around JKR website today and 
was reading some background info on Dean Thomas.  Apparently his real 
father was a wizard.  Now I realize that everyone's busy talking about 
prefect points, and who likes who, and what's going on with Snape, 
but has anyone thought that maybe Dean's the HBP??  It said on her 
web page that it was info she was hoping to get out in CS but wasn't 
sure if she would get it in anywhere now.  Does anyone know if there 
is anything.   Waiting patiently for someone to explain why this 
isn't possible.  
Jennie