Polyjuice Potion!Dumbledore (TBAY?)

[jastrangfeld]

No: HPFGUIDX 45995

So we know there was a gleam in Dumbledore's eye in the end of GOF.  
What if somewhere back, oh lets say all the way back to year 1.  What 
are the chances that at the end of year 1, when Dumbledore has flown 
off to the ministry on an urgent owl, that he was overpowered by 
someone in the ministry, and locked in a box or cage the way Moody 
was, and the Dumbledore we have seen from then on may be a polyjuice 
potioned lookalike?  It would explain the gleam . . . But then, maybe 
there's another spot in the books this change could have taken 
place?  Would this fit at all with what we know in cannon?

Julie