[thinkingoutloud]

I genuinely think Katie was basing it on who was the 'least entertaining' hence her choices being Alexander and Chloe. She said that 'here in 2015, Alexander (he) doesn't seem to be able to speak' and she also made it clear that she thought Chloe had nothing else to her aside from her assets which was the reason she was in the house. I don't believe there's any deeper reason than that which people appear to be searching for.