Norton's double-play, borrowed from his Oscar-nominated role in Primal Fear, gives him a chance to show his chops among the more seasoned veterans.
Sure, he too has done better work, sometimes with similar characters: he's switched between different personalities in both "Primal Fear" (which got him an Oscar nod) and "Fight Club" (which should have earned him another), and the arrogance of his Jack here somehow reminds of his Worm in "Rounders".
(As in Primal Fear, and sort of in Fight Club , he's playing two personalities within the same body.)
The film gets away with this amusingly tasteless stunt only because Norton, in a variation on his debut in ''Primal Fear,'' does it with such skilled gusto; he makes it seem not a gimmick but a virtuoso ruse.
Norton gets the flashiest parts, reminiscent of his schizoid Primal Fear role (perhaps aided by Oz agreeing to let him write some of his own scenes), since he plays the impatient, smart, young punk looking to make his mark within the inner sanctum of world-class heist artists.