Oddly Baggs may do very well in this phase. He talks a good game, and think on his feet quite well. Assuming he hasn't lied in his CV, it's difficult to counter his claim to be exactly what Lord Sugar needs.
The most difficult question for him is Why he want's this job.
I think LS will take one "safe" candidate and one "risky" candidate. Stuart and Joanna are risky. The other three are safe.
Stuart and Stella would be the biggerst contrast.