I thought that the flaw was different. Because the DS wasn't complete, there was a tunnel that lead to the core for crews to work on it. When the DS would be complete, the tunnel would be filled and there would be no weaknesses to the DS. Palpatine let the Rebels know that it was vulernable. Otherwise, they wouldn't have attacked the DS at all.
No, my young padawan (always wanted to say that 😉 )
"Now you will see the power of this fully armed and operational battlestation!"
I would say it is a complete station.
They didn't complete the circle for the same reason as you thought jedi212guy; so they would think that it wasn't complete. And again the rebels would find a solution
It's still the same weakness whatever way you look at it.
The first death star was destroyed by a small fighter.
The second Death star was destroyed by the Falcon and a small fighter.
The first Death Star was destroyed by blowing up one part which caused a chain reaction.
So was the second.
The second Death Star should have had a tighter defence against small ships. And it shouldn't have had it's main power source linked to the entire station. If it's generators were spread out then it would have blown completly.