MeanJoePhaser
Admiral
I wish George Lucas would have paid LIAM NEESON whatever he wanted to add him at the end of the JEDI as well. I thoughu Liam was one of the best parts of 1-2-3, and seeing him at the end of JEDI would have been cool.
Rob
Wouldn't have made sense within the original trilogy. Luke would be "Who is that guy?", some ghost he never met.
And when it comes to seeing the future, Palpatine can't see everything (didn't know Vader would wind up a mangled half-a-man), and let's recall that he is a lying asshole through and through. Had he known about the twins, he would've sought them out...yeah, it's a big galaxy, but he controls most of the known systems.