13 (musical)/WMG

The Broadway production of Thirteen was 90 minutes long. '''90. Minutes. Long.''' But still, crazy teenagers come up with theories.

Kendra and Brett will end up being a On and off couple
Seriously, the musical has enough evidence. Eventually, Brett will realize that Lucy lied to him, and go back to Kendra. Lucy will manipulate the situation, and Brett will go back to her.

Archie and Lucy are cousins
Lucy and Archie are both very manipulative. It makes sense that they would be related. It wasn't mentioned in the musical because everyone already knew, and Evan, being the New Transfer Student wasn't told. Plus Lucy wouldn't want to admit that she's related to the loser cripple kid. This is why Archie helped Evan get Brett and Kendra back together despite his crush on Kendra. He wanted it to be a Take That to his cousin who screwed up Kendra's life.

Molly, Cassie, and Charlotte are the Greek Chorus.
They don't really forward the plot. They just help spread the rumor in "it can't be true." They definitely show some Greek chorus traits in "opportunity".

Lucy doesn't really like Brett

 * The whole thing was revenge for being forced to be in Kendra's shadow.
 * Or the whole thing was to get out of going to Evan's Bar Mitzvah because everybody knew Patrice was going to end up going anyway and they didn't want to be there if she was there.