if you want to see if was right choice is very easy.
Calculate the ss kms before ss 9.Find how slower from Ogier was Mikkelsen at all these kms.
Do the same for stages 9 and 10.
Imho was a good choice.
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Bouffier stopped on tracker
Edit: moving again
If Mikkelsen himself says he is not sure if it was the right choice it tells everything...
100% sure that Tänak would be a lot faster than Ostberg if they were in the same team, very poor performance. It isnt his favourite surface but it isnt Tänak's either.
and just to confirm my guess Evans goes even faster than Ostberg.