Unfortunately I think its probably no more than 2-3 due to their small population (if seats allocation follows the conventional method, which emphasises on population count). Albeit the small gain the biggest importance is for PTI to be able to form the local government there is so that the mir jafar coalition cannot wreak havoc in the newly formed province. The biggest gain though for PTI should they form government, would be that they would easily take away half of the senators from GB, further solidifying their influence in the senate. [Though not sure if GB will be allocated any senate seats in time for the next senate elections in march].