Well, the reason I tried the ROTS clip was that someone (I forget who) suggested that it's not really necessary in ROTS...it's a nice image to leave the audience with and it's fun for us fans...but not really necessary. As Lucas might say: “We know where he ends up.”
It also brings up the question of how long it takes to build a death star. 20 years? then between ESB and ROTJ maybe 2 years? Why?

Erikstormtrooper:
Thanks for pointing that out. Yes, the clip would have to be reworked a bit...Tarkin erased and all of that...

AuggieBenDoggie:
No, we as the audience did NOT know a second death star was being built during ESB. A lot of people here on the boards thought that the second death star kind of came out of nowhere in ROTJ. A cheap trick if you will. A rehash. Anyway...that was where the idea came from...