Pak-China relationship is based on so many factors.
The Uyghurs are not a factor at all, although some people are trying to make it into a factor. You are falling into their trap.
My position on the Uyghurs is that, while they have some legitimate concerns, their best interests will be served in the long term by working within the Chinese state. If they become independent, they will be nothing more than a pawn like all the other CARs out there. The foreign countries which seem to sympathetic right now will only try to exploit them.
Within the Chinese state, the Uyghurs have access to one of the most dynamic economies, rising living standards, and a host of opportunities that a billion-plus market provides. Of course, their concerns about cultural identity will need to be addressed, and I believe the Chinese government is well-intentioned, even if their policies may not always work due to some ingrained anti-Uyghur stereotypes and discrimination.
Don't underestimate the foreign players -- they are masters of manipulating public opinion.
The Chinese government may know the right way to handle the situation but, in the face of large scale terrorism or other incidents, the government will be forced to address public opinion. This may force the government's hand in ways that will prove detrimental in the long term -- not just within China, but for China's image and relationship with the Muslim world.
There are 25000 mosques in Xinjiang,averge 400 people with one mosque,compare with Egypt 2500 people with one mosque,Iran 11000 people with one mosque
You should know most Uyghurs know little or none Chinese,because most Uyghurs are Minkaomin民考民,those people in school leared Physics,maths.chemistry and so on in their own language,they also learn Chinese,but just like most Chinese learn English,most Chinese can't speak or understand English,most people forget English after they graduated from school.Same with Uyghurs,in many parts of southern Xinjiang,Uyghurs make up 100% of the population.They don't have the language environment to remember what they learned in school.And in China,all Universities taught in Chinese,it's not easy for those Minkaomin study in Universities.So most of them graduated in high minddle school. If they live in Xinjiang,it's OK,but if they leave Xinjiang,then they can't live,because they can't communicate with other people,but southern Xinjiang is poor,only farmland,it's naturely they move to big cities to seek better life.
Then we have anather kind of people called the Minkaohan民考汉,who grow up in Chinese language schools and grow up with Chinese students.They can speak good Chinese,but because in those schools,they don't learn their native language,many Uyghurs elites afraid their children will lost their tradition in those schools.Those Minkaohan are just a minority,can't influence their population.
In recent years,many Young people in southern Xinjiang came into east China,but unfortuntly,they were controlled by criminal gangs,the criminals use them to steal,loot and sell drugs(In Ruili,Yunnan,there are more than 20000 Uyghurs,most of them sell the drugs got from Burma).What the government should do?Those young people can't work as labours,because they can't communicate with other people.They can't do bussness either.In the end,they will be still controlled by gangs.And because of this,people of east China have negative feeling toward the Uyghurs.You should know crime rate is very low in east China,people just want peaceful life,you can see their are Mongols,Huis etc in cities like Beijing and Shanghai,but people have no issue with them