George Michael - He claims not to know who Lucille 2 is but they were at a party together, where someone told George Michael Buster was her nurse. This party occoured in early season 1 and he never interacted with her again, meanwhile George Michael went through a lot of events in the 3-4 seasons between these events. Do you remeber people whose life untersected yours once, years ago. I don't remeber my classmates from 5 years ago and we saw eachother every weekday for 5 years, excluding holidays.
Buster - Watch any murder mystery show, Murder She Wrote, Diagnosis Murder, Ironside, when is it ever the guy that got arrested for the crime first? Also Buster is the only Bluth left who is morraly sound, with Michael and George Michael having gone darker, Buster is still relatively kind, not wanting to be a Monster, just wanting someone to love him.
Considering the way she was immediatly repainting the stair car, I'd keep you eyes on Sally Sitwell, she's clearly more sinister than we ever guessed.