^ Seems like a good choice if they'd like to go with a little bit older Ani. I haven't seen those films, but he's got great creds, and he sure looks like Luke's dad.
Characters within the saga theme:
It seems to me that the over-arching theme of the SW6 saga is "Conflicting Loyalties". The love triangle/s, Ani's responsibility to the Jedi and to Padme, the Jedi's responsibiity to the constitution vs preserving the order in extreme emergency, Luke's responsibility to eliminate threats to the alliance vs calling back his father. Vaders responsibility to his master that saved him vs the son he has met. All of these conflicting calls upon loyalty should be emphasised as much as possible, made as difficult for the characters as will work as drama.
In this context, having Luke face all of this as a half-trained but very gifted apprentice might work the best. The protaganists should always face overwhelming, impossible odds and know it. Yoda could acknowledge that Luke is not at all prepared for what he must face. Luke could stroll into Jabba's palace, obviously trying to bluff his way through, without knowing the outcome. He might surrender to face the Emperor simply because the party will be found if he doesn't. Luke might be shakey from the start and looking for an opportunity to kill Vader and then the Emperor. This might give even greater power to "I am a Jedi, like my father....";/ Worth considering, anyway, IMHO.
This leads to a possible improvement to the close of ROTJ. A knighting. An enormous forest clearing. It is a mystical, holy place. Gigantic trees hundreds of feet tall surrounding. At the head of the clearing, in the center, is the tallest and greatest tree of them all. Thousands of rebels and ewoks. It is lit by firelight. On a raised platform, in front of the great tree, is a cloaked and hooded figure. Luke strides down the center and up to kneel before the figure. The hood and cloak are pulled back to reveal Leia in a 'Goddess of the Forest' dress. She looks very worried. Luke nods to her encouragingly and smiles as he gives Leia his sabre. He bows low, face down and eyes closed. Leia ingnites the sabre and raises it high over her head and then straight out from her, over Luke. She releases it away from her with outstretched arms. The crowd gasps as the sabre falls, certain pass through Luke. Luke spreads his arms out and draws the sabre around and into his hand. Luke rises and holds the sabre high as the crowd errupts into cheers and Leia looks tremendously relieved. ( Mostly informed by the PT) It is being hologram-cast throughout the galaxy. We see all the worlds looking at a giant hologram of the scene an cheering wildly. It turns into a celebration with fireworks. Scenes from across the galaxy. (Project) At the end, Ben and Yoda appear. They hold out their hands and draw the images of Ani and Padme from out of the Force. They are dressed in white, innocent teenagers once again.