NAIROBI, Kenya ? Four months of street protests in Sudan gave way to a burst of political upheavals this week that - on the surface at least - appears to have upended the status quo after 30 years of strongman rule by Omar Hassan al-Bashir. Yet the heart of the old regime is far from gone. Sudan now seems tossed into power battles between different factions of the military, which turned against Bashir on Thursday in a stunning end to a leader who had managed to ruthlessly quash dissent for decades in one of Africa's largest nations. quot;This isn't an unfamiliar situation when a strongman falls,quot; said Zach Vertin, a fellow at the Brookings Institution and a former senior adviser to...