Rewatching Fresh Meat

I have 4 questions for those who are fans from the beginning and saw this season when it first aired:

Did Derrick and Diem date after the show or was this just a hookup during the season?

Why did we never see Chanda again?

Why did we never see Theo VK again?

Were you all surprised to see Aviv when she showed up on Eras considering she only did one season?