I agree with some of the RT article - it's not as good this year and it's definitely meaner, but also yes, the cast are just generally more confident in themselves.
But mainly, the producers have to choose people who can ham it up on camera, who can give good face-to-face analysis in the 'diary room', who can talk in soundbites. Who are 'TV ready'. Because the format of the show is a performance. Many can watch and imagine we could do better, but to translate that to being on TV is very different.
You can see the struggle in Linda...('absolutely' 'wow' 'really' 'right') she is 'drying' on stage! Therefore, the 'byproduct' of this is she has been cast in 'crap traitor' role in the edit. I wouldn't be surprised if she was encouraged to 'cry' at breakfast to give more material.
Minah is much more confident and articulate, so they use her more.
And then there is the after-show stuff. By now it's obvious the interest, so the cast choice has to reflect those who can carry the story through after the show has finished. That was maybe not so evident or expected in the first series, so the casting now will have become more biased to 'TV ready'- (and perhaps unconsiously, 'oh everyone loved/hated Harry last year, let's stick in someone similar as a red-herring or whatever).
I really think it is not the participants calling the shots as the article seems to imply.
But also, really, what clues DO they Faithful have to go on at first? There is no concrete evidence so it will always be, 'you look shifty'... 'you give me a Harry vibe'
^ I agree the tasks could be more clue-based. It would be great to have clever evidence they have to piece together.