Because OP people love to make up dumb stories about how they are "favoured" by the producers and want a Clifton win every new series...
Kevin has been one of the best additions to the show, at least he has enthusiasm and genuine spark of personality... He also reads his celebrity partners well, teaches and dances great routines and never dances above their level or shows himself off
Brendan lost that years ago and has been going through the motions, until he had Sophie in 2013... that was a brief comeback. The whole hover-board thing in Anastacia's Jive was a complete mess and all about him!

Same story with Anton until Lesley this year & Katie last year.
Joanne I'm not that keen on. Never had a decent partner and I don't like Ore at all... fake smiles and cry baby tears
Scott Mills... I want to say Samba ? to 'Under the Sea' from the Little Mermaid was truly the worst dance I've seen on Strictly... ruined a good song too
Karen seems like fun but the bullying and bitching rumours seem to stick with that one... dunno how she landed Kev who seems genuine and sweet!
Overall they should dump Jo and Karen after this year... well at least Karen after the Will fiasco... but keep Kevin as he's still invested. They need to keep the bubbly, fun dancers otherwise it'll be a boring show with no big personalities.
Would be happy to see Janette Manrara get to the boot too, she is woeful and always gets a biddy dancer who's only good at one dance... poor Melvin couldn't even manage that this year.
Oh and Giovanni... always has a creepy eye watching the ladies... I'd bet if he's back next year the GG fans will still sabotage any partnership they put him in... needs an old biddy like Ruth Langford, the 'golden oldie' they get from soap-land or Lorraine Kelly!