#3 Rusev
Rusev's WWE career has been nothing but a roller-coaster ride. He started off with a big push but then slowing fell down the pecking order. He got another push last year when he was with Aiden English but then again, WWE broke them up abruptly.
Now, again, it looked like he was getting a push after he won the US title around Christmas but he dropped the title at Royal Rumble to continue his streak of not winning a single match at a PPV for over 2 years!
Adding Rusev to the Elimination Chamber match would have given it a new twist and WWE could have squeezed him into the title picture too. If not, they could have started a storyline with Orton or Jeff Hardy – something the fans would have enjoyed a lot more than what he is currently doing with Nakamura.