What Buhari chooses to do with appointments not regulated by federal character is his prerogative.
The gladiators who won the victory have shared the spoils of war (if i may borrow the greek/roman expression).
1.Economy
2. Security
3.Anti-Corruption
To have kept this country fiscally afloat despite the massive drop in oil revenue and a depleted foreign reserve (which he has now grown) , is a miracle by Nigerian standards.
As at the time Buhari was campaigning in 2014, the bane of Nigeria's security challenge was the Boko Haram menace . They held approximately 14 local govt areas across the northeast and had progressed to the FCT with the Nyanya and Banex bombings.
I will speak more on this when i address the Atiku alternative at a later time..Thank you