Is there any reason why ROTS can't go...
1. Anakin saves Palpy from Windu; Windu dies
2. Anakin flees to Mustafar; Anakin is left for dead w/ the lava
3. Slaughter at the Jedi Temple, feat. Darth Vader
?
And hey, if Palpy makes some reference to his apprentice, Darth Vader, when talking to Anakin earlier... the illusion is complete.