What's your goal in this, Adam? To convince Fthagn supporters that they should vote Truman since both will govern similarly? Even if that's true, it still makes sense to back the incumbent (Fthagn) - if switching incumbents will cause little to no change, then you may as well keep the current incumbent. No need for going through the process of transitioning the government if it will have no long term benefit.
By using the let's keep the incumbent philosophy you are approving of the way the incumbent was appointed to the job by resignations and nomination to give someone the incumbency advantage and how they made a farce of democracy.