it would be good if sidious is only ever seen as a hologram throughout TPM and AOTC, it would distance him from his minions, and would make him seem more illusive.
MAYBE in TPM, if all scenes of maul and sidious were cut, we could be lead to believe that MAYBE maul was sidious, so we are left confused in the same manner as the jedi. though to be honest, those scenes are some of TPM's redeeming features.