Tyrphanax said:

So he couldn't have completed the prototype at the end of ROTS himself and used it?

Alright then. I guess Vader would have given everyone in the galaxy a puppy.

I guess he could have. But, remember what he told admiral conan antonio motti???

He wasn't impressed with the first original, or the second, death star for that matter too. He viewed the death star as overkill, cheesy, and totally worthless in comparison to the power of the darkside of the Force..... In a new hope, he didn't seem like such a big fan of it.... That was all the idea of tarkin and the emperor.....

Maybe Emperor Darth Vader would have destroyed Alderaan and despayre with the Force Storms.

However, how many planets would they have destroyed if the rebels alliance didn't defeat them???