My reasoning for thinking Ken didn't deserve to win is because he didn't form any relationships outside of David, Hannah and Jessica (Adam sort of here to). So in the entire game, he built bonds with 4 people, and 2 of them were sitting in the final 3 with him. You NEED to have allies on the jury to stand a chance at winning in today's game. He didn't get along well with Chris + Bret + Sunday, he never tried build relationships with Michelle, Jay, Taylor and Zeke. He started to build a relationship with Will, but then he blew it within 5 minutes. Will had a confessional on or just before his boot episode where he talked about how Ken was a hypocrite and didn't follow his own morals, just ripping Ken apart. I get the feeling that a lot of the jury had a similar opinion of Ken. Not to mention Ken kept preaching a game of loyalty, and then he votes out David, his closest ally in the game. It just wasn't a winning strategy in today's game.
Hannah was largely the same as Ken. She seemed to isolate herself from a lot of the jury. She would play both sides, but that was often times through extensions of someone else, like Zeke, rather than building the bonds with everyone. I thought Hannah gave an admirable final tribal council though, better than I was anticipating. It just didn't show up with any votes.
A reason someone like Bret was seen as a threat and HAD to go was because everyone liked him, he had a bit of a bond with everyone. He had Chris + Sunday on the jury and he had a good relationship with Zeke. That alone is a strong probability of 3 votes.
Adam didn't have as strong of bonds as someone like Bret imo, but he did have Jay and all the other people that he would try to build bonds with even if he shot himself in the foot occasionally. Adam played the best modern game of those in the final 3.
Bit of a side note, but I'd be feeling really down if I was Ken. Voted out his closest ally to have his best chance of winning. His best still didn't even get him a single vote. He basically prevented his friend from winning a million dollars (assuming David wins the fire making challenge).