The argument shouldn't be about whether one prefers Claudia or Zoe. For my money they are completely different and Zoe is the natural for mainstream big budget showbiz-style tv programmes. Claudia is clever, whacky, funny, thinks on her feet, subversive and altogether glorious, but NOT on SCD.
What should matter is the partnership and there simply isn't one with Tess and Claudia. The gulf between them is vast and the funnier Claudia gets, the more she makes Tess look dull and formulaic. For my money Claudia should go back to ITT which is the sort of small intimate programme that best suits her talents, and Zoe should replace her.
It's pointless talking about replacing Tess. She was brought in as a No. 2 to a big showbiz name. The BBC should never have put her in the No. 1 slot because she simply isn't right for it, but they will never admit that. The best they can do is get her a sympatico partner and that so isn't Claudia.