You confusing registration with casting votes, Voting was an absolute joke but the registration seems legit, why would someone register more than once
Now that I think about it, yeah it seems to be like you said. Ethiopians allocate seats based on registered voters, so in the eyes of the central government it doesn't matter how many times you cast your vote nor the corruption levels on the ground matter to Arat Kilo.
Federal projects are built and funded by Addis Abeba also the top officials of Somali kilil are appointed from Addis Abeba as well. When you take into account how two Zones of Oromia have more seats than the whole Somali region and add the fact that Ethiopia is being administered by a single party, the end product pretty much eliminates Somalis as a threat to the central authority. It seems to me that the Ethiopian system is very efficient in keeping the fringe ethnicities in check without firing a single shot.
Addis Abeba has only one incentive and that is to downplay the number of registered voters. Any ideas how they could accomplish that? What is the process of getting registered in Ethiopia?
What I gather from all this is that fierce competition between Somalis is pretty much encouraged. Kebeles that get cheated out are left begrudged and ripe for exploitation by the predatory expansionism of Oromia. Divide and conquer, and divide again to keep the gains, is the name of the game.