It´s nearly impossible to drive at gravel in central Finland between mid october and april. Roads are too wet/soft or icy/snowy.
I agree that TGR did´t 100% want Ogier for 2017

To me main question is: How fast is FiestaWRC18 ?
If FORD is not coming along, is development slower than other teams do?
If Fiesta18 is fast enough against other WRC´s, I see no point of team change for any current Fiesta17 driver.
But I´m still pretty sure that driver(s) are switching and I don´t believe that money/salory is the reason.