Yep, i agree, Hyundai also didn't get Neuville a taste of the new generation car until he signed a new contract. As for M-Sport and Toyota i think it's normal for them to have a driver like Ogier to test the car, for sure the feedback, how small it maybe will be after a (short) test, both teams will be pleased about it.
Hyundai has a strong driver line-up and i don't think there would anything changed, perfect for them would be Latvala in a fourth car in rally's like Sweden, Poland and Finland (and to be nominated and not Sordo).
If Citroën is smart they get Mikkelsen and switch between Breen and Lefebvre for the third car.