Presumably, the pylon was reattached somehow. There wouldn't have been time to build an entirely new one.
It was blown to pieces! Ain't no way it would be reattached when it is in a few thousand pieces!
You are absolutely right TheGodBen about Weyoun, the character's greatest strength was that he remained so consistent, from beginning to end. Of course Jeffrey Combs is amazing with his acting range; going from stately to deferent to arrogant to smug to curious and it flows so naturally. Jeffrey Combs is definitely in the top five actors of Star Trek. The other four being Patrick Stewart, Brent Spiner, Marc Alaimo and Andrew Robinson.