Davey Johnson............
Like the style or not, he's a combative guy. Good & bad. Johnson has drawn the ire of a few of his former employers.
Cincinnati he quarreled with a lot of people including front office. Similar issues in Baltimore. While there are no known issues of problems with the Dodgers, Johnson was gone by season two after finishing 2nd. Sounds like he burns bridges wherever he goes. Going to be very interesting with a young squad this year though.
If he gets stubborn with the wrong people and the players don't respond to him, he might be out of a job after the season is over and the Nats lose 90 games, thus blaming your prediction on the meds. :)
Just had to say that last part for a laugh.