Um I'm sure he knows Jenny. Alex is the type where he probably still would have thought she was pretty when she was chubby so possible flirtation beforehand? I don't know we can talk about that if you want.
I'm sure he and Emerson would get along well. Alex is kind of awkward around girls or at least the ones he likes. They can commiserate lol
I'll check out Ariel's info to see if maybe they might at least be aquaintances? Rose as well.