We can forget Bottas. This year in Hungary on better tyres he didn't even try to pass Verstappen for second place and at the British Grand Prix he settled for 11th, not trying to pass Vettel for the point despite having a faster car and fresher tyres. This isn't new we've seen Bottas failing to engage throughout his career, I'm sure he's a nice bloke but he's not a racing driver.
Bottas is a firm number 2 and his constipated presence in the other Mercedes seat should be causing some discomfort, re-signing him is the wrong decision, they need a someone with some balls who might be a capable number 1 when Hamilton retires.
Bottle is very competent but Wolff has made a mistake resigning him. He had the chance to get a younger driver in the car next year. A wasted opportunity.
The Australian has never fared well at the Sochi Autodrom