First off, I'm never worried I'll lose money betting on the ignorance of the MC!
But more seriously, you keep saying Becky is guessing. I think Sarah flat out told her she's getting her tuition paid by turning tricks. I don't think Becky knows all the details, but I think she gets the
scope of the deal, which is the part I think the MC is missing. The MC knows Quinn uses the girls to earn money (
evilly!), but not that it's on the scale of free tuition.
I think you have this backwards: DPC loves drama, but hates consequences. Jade being present can't have any consequences (she's not going to admit her affair!), but will have heaps of drama. Therefore Jade will definitely be present and will have copious opportunities to stare daggers at and hurl innuendo-filled barbs with the MC. Likewise I expect Burke to have some good innuendo of his own if he has the videotape, but of course he won't actually reveal the truth at this time.
I agree with you that Jade won't really care about the MC if he rejected her advances, and Tybalt will likely be a non-factor no matter what the MC did.