There is a difference in Taliban.

1- TTP(agents who after afghan war sold themselves for dollars)

2- Afghan Taliban Mullah Umar Group (Mujahideen)

TTP(supported by CIA and RAW) is made for the specific purpose of destabilizing Pakistan and defame the image of Taliban. Salala checkpost attack was deliberately made because these check posts were a big hindrance for insurgents in Pakistan. And till then Pak Army had cleared that area from TTP so it was necessary for US to insert more agents so that they can claim rights for drone attacks and staying in Afghanistan for a longer period.

US is facing severe consequences in Afghanistan due to Afghan Taliban and not due to TTP. TTP has never supported Pakistan but Afghan Taliban are supporting Pakistan and in return Pak Army is also supporting them (Haqqani Network).