Yep Karish is from Grendel's leverian and he is an executor. But again look
1)...Executor Tuvul was one of the ruling Seven and head...
2)...a surviving Orokin Executor – a violet-scented brute named Karishh ...
3)...one Executor you coveted and despised most. You presumed to raise your foul hand against him. One of the Seven ...
4)...Avantus' Executor status meant that she...
Only Ballas and Tuvul are mentioned to be one of the seven.
If seven=executor why do they say it twice. Like emperor emperor??