What's tora bora ? Barely a cave !
Tora Bora has strategic value, ISIS is more secure there, Tora Bora is mountain having caves.
Tora Bora is close to Pakistan
US is using Al Qaeda and ISIS as proxy to down Muslim countries for Greater Israel agenda.
ISIS can easily enter in Pakistan through this route.
In Past, TTP who belongs to Al Qaeda Network entered Pakistan after US Air Strikes on Pakistani Security Forces in Pak-Afghan Border.