2. Big Show
There's an obvious reason why Big Show makes sense. He's likely going to be the biggest guy in the match (even if Khali is in he doesn't really count) and as a tribute to Andre they might have the modern day Giant win the match just like Andre won all those battle royals 30 years ago. Remember, when he first debuted in WCW they tried to say he was the son of Andre. It wasn't true, but in the wrestling business they love telling lies like that. At least they stopped saying it soon after when people realized it was too silly even for wrestling. It's not like Big Show has that many years left in the ring at this point in his career. He's in his early 40s, they will have a hard time replacing him when he's retired and it would be a cool moment to see him holding that Andre trophy. As a fan, it's always fun to watch the giants in these kinds of matches. It's a thrill to see people try to eliminate them from the match. If it happens it's a big deal. If it doesn't then the big guy won just like he was supposed to. While it would make a lot of sense to put over a younger guy in the battle royal, if there's going to be a veteran that wins the match it will likely be the Big Show.