The Jianwen Emperor began to show independence from his uncles and cousins. He began relaxing the purges, rehabilitating the victims of the secret police, and began the process of looking outwards. Then his uncles and cousins started a rebellion.
With the capital in flames the Jianwen disappeared from history...
What if the Jianwen defeated his uncles?
How would Ming Dynasty History Go?
Remember at this time Timurlane was looking towards expansion - he dreamed of Genghis Khan and of conquest of China.