India has never had any sort of communication with the Taliban, and it likely never will. Not saying that they aren't capable, it's just that any link with the Taliban will make them look bad, if discovered.
Northern Alliance is dead, and has been replaced by the current Afghan government which is filled with former Northern Alliance groups. If the Afghan gov falls, then it's all over for Afghanistan for another 30 years.
In the end, Pakistan will suffer. No matter who comes to power, Pakistan will be scapegoated. The Afghan gov survives, they accuse Pakistan for supporting the Taliban and create instability in the tribal regions. Taliban comes to power, they accuse Pakistan of supporting NATO forces in Afghanistan and launch terrorist attacks in Pakistan.
No matter who wins, Pakistan will end up being a scapegoat.