I don't know why Toyota would care/ hold THAT much of a grudge about losing Tanak - plus seems like that wasn't a total sporting decision anyway from Tanak etc.

They replaced Tanak and got the current 7x world champion, Evans 2nd in the championship and the hottest prospect in the WRC for a long time in Kalle. Tommi is massively responsible for ALL the success they've had, and they haven't missed Tanak (Kalle vs Sordo/Breen/Loeb is the reason they didnt win the manufactures).

Could more just be a case of trying to cut some of Tommi's control over the whole operation as they move it totally in-house, and maybe the fact that Tommi is not really a good face of a team that hugely values good PR. Jari will be loved by Japan (already is), and is a much warmer and more engaging face of a team.