I remember as a kid, asking my dad when we watched, it only made sense to check regularly on the megalomaniac.
He said, Captain Kirk was a cowboy and could be unprofessional, and not surprising he forgot. I assumed he knowingly meant to leave Khan to die.
If I had to pick in no particular order, I would be Lore, Q and Reg Barclay. With the later two due to the the first being literally impossible.