I think Symmond's quote is very telling and shows why he races the way he does. He has absolutely no confidence when racing Africans. He stays at the back because he's afraid to push himself. He goes into every race thinking that he won't/can't win and that 3rd or 4th place is good enough.
That's why he'll never medal or be a champion on the world scene. He doesn't believe in himself.
With better racing tactics he could have broken the AR and won the bronze last year. He needs to grow a pair and try to match the Africans. I wish he'd just have one race where he goes out in a 49.xx and sees what happens.
Symmonds could have always run a 1:42, but his lack of confidence and stupid tactics hold him back. It's a shame really...