As Omar is one of the major founding members of the Taliban and appears to really set the tone of the group, losing him would set shockwaves down the lines. It would also open the group up to division amongst the Taliban as various factions attempt to grab power. Another factor would be the chill effect on the Taliban leadership and comms as they attempt to figure out how he (if he) was exposed. Likely a lot of loyal Taliban would fall under suspicion which would lead to mistrust and executions. This is similar to the final end of the CT’s in Malaysia, the brits had succeeded in turning so many CT’s they didn’t know who to trust, they murdered their own and comms fell apart allowing the Brits to role up cell by cell. One tactic at this time was interrogate a known captured CT and then release him in such a manner that made them suspect in the eyes of the CT leadership, this then forced them to spy for the Brits for self protection leading to more captures and defeats for the CT’s.
One can dream but I will not be holding my breah.