- everyone raises good points but i think we have to remember that they knew the death eaters would expect harry to be with the most experience auror - mad eye, and then kingsley etc etc .
- ** the other important factor is that if harry was the one who took the polyjuice potion, he ran the risk of being killed - if death eaters thought he was ron, they would not care for his life- and dumbeldore had known this would not suffice in the destruction of voldemort, even if one of his horcruxes were destroyed (that being harry) we soon learnt he could not physically tell when one had been destroyed and would have continued to take over the wizarding world.
- the polyjuice potion i gather is made as a basic mixture, to which whoever's hair is added, the potion will take on unique characteristics for that person - harry's was gold... bellatrix lestrange's tasted foul hermione had said.