What if...? - My last minute theory

[vmonte]

No: HPFGUIDX 172069

Miss Vassy wrote:
But I have a question, in all but one of the cases that you mentioned
of people not being what they seemed, they were using polyjuice
potion. Do you think that the Dumbledore who swallowed the potion was
someone else using a polyjuice potion and pretending to be Dumbledore?
Or did you mean he was like Tom Riddle, pretending to be a good guy
when he was really evil and someone else (Snape maybe?) was the goody
guy that got the bad wrap from everyone?

vmonte responds:
No, I meant that he may have had a checkered past. He may have not 
been a good guy when he was younger.