What if we think about this through the lens of the encounters Kenobi had throughout the prequels/clone wars series?
Was Kenobi ever directly involved with KAM outside of the council chambers? If not— and some Clone Wars experts might prove me wrong here as I didn’t watch it— then I would be surprised if he’s required.
Most of the toons required so far are associated with encounters that Obi-Wan was involved in, e.g. Grievous’ death. However, Aayla’s requirement bothers me. Were her and Obi-Wan working together a lot in the clone wars series?
If Grievous is required, then I do think Darth Maul and possibly Cody are going to be in the next batch.