The presence of the UN Secretary General in the Sudan is very important for two reasons: the fragile North-Peace Agreement is in need of support and importantly peace in Darfur. Everyone knows that.
The failure of CPA in the South will surely hamper any progress in Darfur. How can you believe Khartoum about any agreement in Darfur if they don't honour another in the South? The government in Khartoum don't seem to see this or they are just playing a game of wait and see.
Ban Ki Moon has a big task in his hands. If he failed the people of Darfur in his first year in office, he will be remembered for it years from now, no matter what he does again for the world. Now, everyone is giving him the benefit of the doubt.
I pray he succeeds.