Ultimately the Pakistanis will pay the steeper price in this war.

There are many anti-government subversive groups operating in Pakistan, like the anti-Punjab Balochs in the south, Lashkar-i-Jhangvi, the powerful Haqqani Network (HQN), the TTP, and others.

On behalf of the Taliban, these groups will conduct asymmetric and terrorist attacks inside Pakistan, causing large amounts of casualties and humiliating the ruling generals in Islamabad.

When analyzing this issue, here are some starting points or "generalizations":

~Afghanistan has never invaded another country
~This conflict is basically Pashtun versus Punjab
~The initial cross border skirmishes might have been over lucrative opium smuggling routes
~Pakistan is basically an army with a country
~The Taliban have become the Vietcong of SW Asia with decades of experience fighting each other, the Soviets, and then us
~Pakistan's army has much less combat experience than the Afghans, although their air force demonstrated capabilities against India