During the brief period when Hashirama and Tobirama were on paid leave, Izuna not only appointed Kakuzu finance minister, but also met with the clever pineapple heads of the Nara Clan.
The members of the Nara Clan were astonishingly lazy, but just as astonishingly clever. Faced with Izuna's strategy of a knife hidden behind a smile, with rewards and threats in equal measure, every last one of them sensibly scurried off to handle internal affairs.
Before leaving, the pineapple heads could not help marveling: since when had the Uchiha Clan produced someone like this?
The Hyuga, Aburame, and Uzumaki, clans on good terms with the Uchiha, were also selected for the first wave and given important positions with real authority. Izuna recruited quite a few capable civilians as well.
Even capable members of their old rivals, the Senju, were kept on. Anyone who saw this would have to praise the new Hokage for his open-mindedness and for rising above narrow clan loyalties.
It was fair to say that Izuna had met with every Shinobi Clan in Konoha, along with the civilians, and assigned plenty of positions.
With just one exception: the Uchiha Clan.
It was not that Izuna did not want to use his own clansmen. It was just that the Uchiha really did have a few little problems...
The Uchiha Clan's biggest problem might well have been its own geniuses.
Other Shinobi Clans' geniuses: extraordinarily gifted, immensely powerful, and brilliantly intelligent. They took revitalizing their clans as their responsibility, single-handedly supporting their entire clan's future!
Uchiha geniuses: people who possessed both strength and intelligence did exist, but almost nobody had ever seen one.
One relatively recent example was Izuna, but he had died once. An even more recent one was Shingetsu, but she was half Senju.
Tobirama had once