Bingowings what about if the rebels new exactly when the Emperor was in his Imperial Palace. Would that make it viable?

Or perhaps they finally had someone in place which they could not do before to blow up the reactor to plantery shields to allow the rebels access to blow up imperial palace with fighters and capital ships with the Emperor inside.

Maybe somehow get R2 to sacrifice himself. He is loved and adored and it would mean a great sacrifice even though he is only a droid. He could be the bomb that gets the planetary shield offline.

All this talk of ROTJ and what it could of been is making me like the movie less and less. :-(