There were aspects to Zee's attitude which did seem to point to him being sexist, however I suspect some of that is down to the edit rather than anything else. I think he brought Natalie back because she had been in the bottom 3 before and Sugar referred to this I think before Zee made his decision, I could be wrong though. He brought Leah back as she was the leader of the sub team, candidates have made mistakes before but haven't ended up in the boardroom, I think a big deal was made of it in the interests of "entertainment" haven't watched Your Fired yet this series so can't comment. The writing was on the wall for Zee though when he told Leah to throw away the map of Dubai...