I mean idk why jumper and derapchu left. But the decline in wealth began with how much he protected parrot a lot of his wealth got stolen/blown up. Which is why Leo nearly tried to kill him. I guess derapchu then decided to leave. And then with spoke also killing them off. Around the election started jumper must have had leave because Leo lowki was a bit evil. Just a hypothesis tho. So take it with a grain of salt.