There is also someone that we forget quickly: Alexis. at the end of the update, we are still in the bar with her. there is still time for her to try and insert herself on the weekend trip too...
on the same day, she tells MC that she would never leave without telling him, so she certainly expects the same from him, as her standards are very high for him. moreover, if Erynn is going, she could want to come too. now, Lakeyn being the person she picked up at the airport might be a hindrance in this, but she could also drop that quickly for a weekend with her "i love you" boyfriend, or at least offer to meet him when she accompany her cousin back in Alvarado. She also already met Nathan in Lakeyn's shop, as she remembers him vaguely from the pictures.
Moreover, if you are with Nikki, you can hide her from Alexis completely for now. so there needs to be a consequence for having lied there, because you couldn't hide Cara before.
the funniest thing would be for the whole family to go then. Alexis, Layla and Adrianna, whoever path you are on
Layla's lessons with Gabi seem to be finished. the weekend is coming. but yeah, Layla is the easiest to justify not coming with MC.
there is no reason for Santiago to be nice to a random kid. he meets MC at Dylan's bar, so he doesn't know if he is a good prospect at that point. and Marauders' fans are a dime a dozen in that bar, he met tons of them before and after MC, who doesn't make any particular impression on Santiago except making a call and stepping out during the game.
Santiago is a pro negotiator, so keeping a poker face is second nature for him.
it's Darryl that boasts that the agent comes for him, but the only person he would come for, for his job, is ShaCarri. he doesn't come to talk to Darryl if MC loses. We only see him greeting the coach, sitting next to the MSU recruiter, and speaking with ShaCarri and MC. and we can speculate Gabi yelled at him over the phone.
most importantly, he doesn't come to talk to MC if he wins the race, even though that would be when MC would be considered a good prospect. he comes down only if MC loses. so that could be interpreted as a father coming to comfort his son. my guess is that Layla is quicker than him in congratulating MC.
You're right, Layla could want to avoid advertise her connection to Santiago as she doesn't want to be asked to introduce them all the time. but she doesn't seem to mind people knowing that Enzo is her father or that her family is rich. And that seems to be weirdly brushed over by every character.
Alexis is surprised that MC hasn't met her dad yet, during the night she announces their relationship to her mom. So the identity of their dad doesn't seem to be a secret. Erynn and Alexis say that Lexi's dad is too famous, in frront of MC, so they clearly imply that MC should know who he is too. and Layla was more hurt that people took advantage of her because of her mom, instead of her dad being rich and famous. When Darryl delivers the chicken wings, he seems to know who lives there, and seems to think that MC lives there too, concluding that it explains all the things he didn't understand about MC.
there is a chance that MC met their dad during the early years, without knowing that it was their dad as he only cared about Erynn and no one else