And so the choice is....Idris Deby or Omar Hassan al-Bashir

Both routinely violate human rights.
Both routinely are corrupt.
Both routinely flout international agreements.
Both routinely use proxy militias to prosecute wars across their borders.
One routinely directs war crimes and crimes against humanity on massive scales in order to stay in power.
One is a regional threat to millions of persons.

So... seems to me only one choice. Go with Deby, and enter an alliance of convenience to ensure humanitarian corridors to Darfur and pressure on the Khartoum regime. The alternative? Stay the arrest warrant and work with al-Bashir. It is that stark.