Taliban factions are reportedly fighting amongst themselves and killing inside the palace...
All of Afghan history is hostile warlords fighting each other. Any alliances have been hard to maintain, and need constant greasing of palms. Like Yugoslavia, the faux country will probably need to be split up into several nations. The one that gives China the best deal for Belt and Roads Initiative will prosper. The others, after trying opium cartels, will probably come around. (just guessing here)
In any case, I doubt the Taliban will kill each other off. Factions will wrangle peace and even the weirdest splinter groups will get tired of being cold and hungry and seek some kind of rapprochement.