It really is difficult to judge how an athlete handles pressure. I dont know Brown personally, nor any of the other two so I cant judge, but I tell you it matters how you react to pressure. Some people choke and so do not reflect their best performances , others just use the occasion to bring out their best.
It is Crawford who picked Brown because of his mental toughness ... I guess he should know he was there and is there .... That does not mean that Brown will finish ahead of the others because other factors also come into play... we have seen some unforeseen circumstances in big events ..like the Cristie fiasco, Burns has fouled out so has Asafa at big meets ... accordiong to Crawford however , all fit and well , it is the head thing that could decide whether you medal or not.
I gave this example previously that in '76 Harvey Glance was the hot runner before the olympics ...he did not reproduce his best form in the final ..... Crawford decribed him as an emotional wreck before the event.
To be fair to Brown ...it is extremely difficult to run flat out when you harbour injury thoughts .... it happens to all athletes ...I am sure we can see it in carlos edwards who is struggling to come back to his best. Picture an athlete thinking about injury...it is not easy .... yet Brown has somehow still managed to stay at his best ...his best has to be better now though but I feel he has no choice but to go for it ..... and I think he can !