Fisher pressured Kap much in the same way you would defend Vick - from the edges and up the middle. In addition to his reading the blitz the receivers also need to read the blitz and sight adjust. Once that starts happening DC's will have to devise a different plan.
I vaguely recall reading something last year that was saying our WRs don't have sight adjustments or hot reads. There is a hot read built into each play so communication breakdowns can't occur.