#2 Randy Orton:

Many people, including The Viper himself, was surprised after they got to know that Orton will not be a part of The Traditional Survivor Series match this year. Orton has been a part of 10 such matches and holds the record for most eliminations, 15 to be exact.
In addition to that, he has also emerged as the sole survivor on 5 different occasions and is also regarded as "Mr. Survivor Series".
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When you come to know about these facts, you find it hard to believe that Orton will be sitting out the event. WWE should have something planned for him, unless he is dealing with injuries which he is probably not.
Expect Orton to attack either Rey Mysterio or Jeff Hardy beforehand to become a last minute addition to Team Smackdown Live. It would be quite strange if the match goes as planned and Orton doesn't get involved.
Moreover, Orton has been targeting Mysterio continuously ever since he was eliminated from the World Cup by him. So, expect Mr. RKO to take Mr. 619's place in the team, improve his Survivor Series record, and properly kick off his feud with Mysterio.