I don't mind Chrissy tbh.
JP, easily one of the top 10 most useless Survivor players of all time. I'm not sure he even understood what he was suppose to do in the game.
Sometimes it depends on the edit they gave him. From our (television viewer) perspective, JP did nothing. But the edit might just have not bothered showing any of his strategy talk.
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In regards to Ryan, I think he made two fatal mistakes midway through the game.
1-Telling Devon, his closest ally and ride-or-die, that he was the only one who knew about the secret idol, then immediately telling Ben about it. He essentially caused his closest ally to doubt his word.
2-Shutting Mike down completely when Mike wanted to discuss strategy with him. Even if Ryan felt his alliance of 7 was strong and Mike was a dead man walking, you NEVER say no outright to someone who is willing to talk, for no other reason than to always keep your options open. Not to mention if they end up on jury, they'll probably think more favorably of you if you at least came across as approachable rather than some dick who didn't give them the time of day until you needed them.