Carl,

If only!

Money talks, so the widely assumed income from the increasing heroin production alongside "taxes" should provide internal and external Taliban factions with a degree of independence. The place has plenty of small arms, remember how many disappeared from the ANSF? Most intelligence is locally acquired and given freely or coerced. Training, with a few exceptions is internal; after all they have the tactical skill.

Where does Pakistani / ISI help fit in? Cadre and technical training. IED improvements (shaped charges allegedly via Iran) and big bombs. Providing sanctuary, subject to discretionary variance.

Would, no could the Taliban continue to campaign without help from across the Durand Line?

Yes.

Now adjust safety helmet, wear fluorescent safety jacket and sit comfortably in your armchair.