There is no logical explanation for Hayden in Jedi- it is just a scheme for the "prequelization" of the OT. The whole force ghost theory is a nonsense theory to explain what was truly a marketing scheme for people to see Episode III. When we did not get the explantion for Hayden in Sith, this leads now wondering of they added stuff on the DVD, which they didn't. Now that Lucas has finished "justifying" the prequels, he is returning to justify the SE.