Kane has slowly but surely evolved into a good worker for his size the last few years. And one of the Internet writers (Meltzer or Keller, I forget who) notes that because he spent so long in a mask and without a voice, he learned how to convey emotion without using facial or vocal cues, and that made him a much better promo and able to sell even ridiculous shirt (like this Taker coma stuff) stunningly well.
Longshot prediction: Swagger and Rey have their match, Kane comes out to watch, teasing that he'll cash in on Swagger if he wins, but he attacks Swagger during the match, allowing Rey to win. Everyone figures that's that, but Kane brutalizes Rey, cashes in and wins the title. Then he reveals at Smackdown (or even as a special appearance on Raw) that he was the one to hurt Undertaker and that he's never coming back. Eventually Taker returns and they meet at Survivor Series (since Taker doesn't appear to be ready to go for SummerSlam)
