Having Malkin probably hurt Crosby's PP point totals.
Perhaps in general over the course of their careers, but certainly not in '07, where Crosby produced at a far better rate than he ever has. Unsurprisingly, he got a point on an unusually large percentage of goals he was on the ice for, as well as a high number of secondary assists on the PP, which generally suggests his point totals were somewhat luckily benefiting from the PPs success.