Conversation so far:
What happened with Gulbuddin Hekmatyar in 2008?
In May 2008, the Jamestown Foundation reported Gulbuddin Hekmatyar's HIG group had recently reemerged as an aggressive militant group, claiming responsibility for many bloody attacks against Coalition forces.
Why had Gulbuddin Hekmatyar' HIG group re-emerged in 2008?
The re-emergence of Gulbuddin Hekmatyar as an experienced guerrilla strategist came at a propitious time for insurgency, following the killing of Taliban commander Mullah Dadullah.
What was Gulbuddin Hekmatyar involvement in the HIG group?
Gulbuddin Hekmatyar was an experienced guerrilla strategist and some elements of the Taliban were becoming disorganized and frustrated.

Question: How was Gulbuddin Hekmatyar involved in it?
Self-contained rewrite: How was Gulbuddin Hekmatyar involved in the HIG group?