A short update on how I view the principal fan theories after playing ep.11:
Mr. Navarro is Santiago - 99%
Mr. Navarro is Gabi's husband and Gabi thinks the MC looks like him.
They look and behave very similar when watching the game.
John is Erynn's father - 99%
Everyone thinks Iris and Erynn look like sisters.
John is attracted to Erynn because she looks like young Melissa.
Santiago/Mr. Navarro is Adriana's husband - 1%
Nyx used the same model for both men, but that's either misdirection or she didn't have a second model ready.
Adriana's husband is a Monroe.
Adriana's husband is famous.
Layla doesn't know even the most common phrases in Spanish while Mr. Navarro is Hispanic.
Adriana's husband is Zo - 80%
Zo is a rich and famous player who played for the Marauders.
Adriana's husband is rich and famous and likes talking about sports and the Marauders.
Valeria's dad is Santiago Navarro - 60%
Valeria asks her mom if she can drive past dad's so she can pick up some of her things. I doubt she keeps things at her dad's office, so that must be her dad's home in Madison Springs.
This means her parents are divorced. Santiago Navarro started an affair with Gabi around 10 years ago and married her at some point between then and now.
Valeria isn't worried about winning the first place to attract the attention of Mr. Navarro, she just wants to beat Sha'Carri.
When Mr. Navarro is actually worried about her being picked by Zach, she brusquely dismisses his concerns.
One problem with this theory is the dude in the gym. Only a brother or a cousin would try to gross out a girl by talking about poop. If that's her older brother, she can't be Santiago's daughter.
Another problem is Santiago and Zo being good friends. Surely if Zo is Adriana's husband both families would have met at least once, and yet Valeria didn't know Layla and Alexis and vice versa. Of course, with the MC not recognizing his best friend's other best friend after 5 years it's possible that none of the girls have seen each other since Santiago's divorce and thus have forgotten everything.