I voted for Glenn, first person this series (only other one was Zoe) who the YF audience said shouldn't have been fired.
I don't buy Sugar's excuse that he couldn't work with engineers. Especially considering that Tom also did an engineering degree.
However, I don't think he would have got that much farther anyway.
Looking at the series as a whole, some tasks were specifically tailored to certain candidates:
App task: Glenn, Tom (to an extent)
Beauty task: Susan, Tom (again, to an extent)
Construction task: Ellie
Paris task: Melody
Biscuit task: Helen, Zoe (to an extent)
Market task: Susan, Tom (to an extent)
Restaurant task: Leon, Natasha (to an extent)
So if the tasks were thought up after the candidates were selected, then LS must have thought that Susan, Tom and Leon would go far. Tom has 3 tasks tailored to him, and Susan has 2.
The candidates who didn't have anything specifically tailored to them:
Edward: went week 1
Alex: went week 2
Gavin: went week 3 (felt sorry for him, he'd only just lost as well)
Felicity: went week 4
Vincent: went week 5
Edna: went week 6
Jim: finished 4th
So only Jim turned out to be a slight surprise.