^ Certainly testing new parts can be a hit or miss affair,RB had to try harder to gain on the W cars which they have now achieved, thanks to Christian's management while the W cars just cruised around comfortably with their pre-time development advantage.
Ferrari as usual had the wrong basic set up as well as Renault as for the rest including McLaren it was just dependent on driver bravery,McL hasn't even got a proper wind tunnel so good luck there Ricciardo