The article is exaggerating. Taliban have also presence in each and every district of khyber pakhtunkhwa, it doesnt mean they control entire province. Same is case with karachi, they have just presence in 30% area of karachi which are pashtun areas. Some of the areas were already no go areas, but wall street journal is assuming that taliban have took control of the areas. Its simple ,taliban draws their support mainly from pashtun population so they first targated ANP in karachi and shattered their influence. Now TTP seems to be the big boss in those areas. They can not control areas like MQM, they are banned terrorist outfit, they are hiding. They are getting arrested and killed by karachi police and rangers and we do not hear about any pitch battles between LEA and taliban which means they are not exactly ruling over the territory....their main purpose is to milk money from karachi to finance their war in north west.