He seems to be worried about time management, and then demotion or displacement. Could you read poly hell
together and talk about how to navigate that?
How about jealousy?
Or more jealousy?
Figure out a time management schedule to try out for a month, see how it goes. If not meeting all players needs, jiggle around the next month. Sometimes it takes a while to find what works, esp as people's comfort levels are also adjusting.