What I said through my response therein was essentially the following: not all terrorists want to be acknowledged for all of their attacks.

Sometimes terrorists don't even want to be acknowledged for any of their attacks; sometimes terrorists don't want to be acknowledgd for some of their attacks but want to be acknowledged for other attacks. And that's not even the all of it. There have also been terrorist attacks that have gone publicly unclaimed until intelligence or law enforcement resources ascribed the attack to an individual terrorist or terrorist organization. There have even been terrorist attacks where no party claimed responsibility and where no party was blamed for the attack.

By the way, Sudan does have oil.