"I thought you were dead" My argument that It might be Kenny
I wrote on another more popular post that I was personally hoping for Kenny as the character who returns. Why else would there have been so many choices Lee made concerning Kenny? You can either make Kenny hate you or love you to death, and the Kenny decisions persist a little while after he 'dies' too, with Christa and Omid consoling Lee and an option being "He was my best friend."
Kenny sticks with you from almost day one of Lee's experiences of the apocalypse to literally the last day, and we saw no body when he vanished. As a sidenote, no matter what happens to Kenny, it says "He was lost to the herd." Lost being a keyword.
The thing is that I have an idea of what could've happened for Ben/Kenny 'death', but no ideas for the "Christa falls Kenny death'. For the Ben death, Ben is covered in blood and Kenny shoots him to put him out of his misery (this is my favorite option with the story so I always take it, I love how Kenny tries to redeem for his hatred of Ben even though Ben was responsible for all of his hardships). Anyways, perhaps the Walkers were attracted to Ben's newly dead scent and much less struggling-body, so they focused on eating him as Kenny escaped? Still, the entire alleyway was full, so any of the Walkers on the ends could've focused on Kenny. I still am hoping he made it out. And as I said before, I have no idea how he could've escaped the Christa death. Maybe there were less Walkers in the building than the alleyway, so he carefully got out.
Whatever the case I feel Kenny would be a perfect candidate for this rebel group's leader. If Kenny was Carver, then it shows his decent to madness as he fights to stay alive for himself, with no friends or family left. If not Carver himself, then at least in a new group to survive. With Clementine showing up again, maybe he'll have a blast from the past and remember (if you decided so) that Lee wanted nothing more than for (possibly Kenny) to take care of her. Kenny's madness would surely be a recurring issue though.
There's also probably a reason Clementine pointed out the duck on the wall of the cabin, and had Kenny's family in her backpack still after a year. I feel it's a story-telling device to make sure we remember (and for an indication to whoever is playing this before the Season 1) that Kenny and his family was, and remains, important to Season 2 also. Because it isn't like we've heard about Ben or Lily or Carley or whoever, but we've seen two hints to Kenny. (We also saw him in 400 Days at Gil's as if to remind us too.)
I also think I may have actually come across proof. I was looking through the chapters of the game and I found the silhouettes of the new group. One of these silhouettes look so much like Kenny it's ridiculous. He has lost his hat, and has new clothes, but I am pretty damn sure this is Kenny's facial structure and hair. You can even see his mustache if your monitor is clear enough.
I'm talking a lot because I have no friends who play this with me, so I'm finally venting my ideas to the world. :P But yeah tell your ideas. Maybe this is just some random old dude, or maybe it is Kenny. I like Kenny because he was very realistic in his 'douchebaggery', I mean, even Lee wasn't perfect during a time when people started eating another. When I first played, I hated Kenny. The second time I decided he was a good character to me, and I hope to see him return, and hope I am right about my picture.
Whether you like Kenny or not, or whether this topic has been addressed before, this is purely a fan wanting to discuss an idea she had.