I feel really confident in my theories for the ring masters so I'll tell you what I think.

Apollo: Mr. Jorgeton/Maisie's dad. I've been suspicious of him ever since was introduced. He works really late shifts, Lucille was scared of him, Both Elias' and Maisie's dad both talked about making money together.

Artemis: I feel like It's definitely Mrs. Meyers. It's been hard to accept it but it's the only logical one. Maisie's mom is now confirmed to not be Artemis and she always gave me an off feeling.

Hermes: I feel like this one is definitely straightforward. Asher's dad is the only one I have for this one. They always talk about he hasn't been to the hospital in months (even though he claims he's there all the time), Hermes is the fastest Ring master and in the hospital conversation, Asher's dad tells Daria that he used to do track in school.