Can't place the sword over the shield. SS's controls have you having the nunchuck behind the wiimote and pulling it back as if you were nocking an arrow. It also looks like the sword blocks the infrared.
Never gets revealed. The Light Side (And thus canon) ending has Stargalenkiller Marek and Kota and Juno capturing Vader, with him locked up onboard the Rogue Shadow with Galen and Juno. They jump to lightspeed with the rest of the Rebels with Boba Fett in stealthy pursuit. Starkiller basiclaly says "Maybe Kota is right and you're just bullshitting me to throw me off my game so I'll become your slave again". The Dark Side ending has you being killed by a perfected clone of Starkiller who is loyal to Vader.
We'll find out if there is ever a third. The team basically got cut from the game and Lucarts will be doing it if they decide to continue the series since they don't want anyone else doing their games. Which means if a 3rd is made it will be shit. Lucasarts sucks these days.