Very true. Shriver was a huge part of that teams doubles success. People just assume it was all Martina based on her singles record, but this is flawed thinking since singles players nowhere near the caliber of Shriver like Raymond and Gigi Fernandez can be doubles legends. Shriver was an excellent singles player, just her assets were much better suited to doubles and her weakness less easily exposed than in singles.
Would she have won as much without Martina? Highly unlikey, that is to be expected when you are playing with arguably the all time and doubles GOAT. However Martina probably doesnt win as much with anyone but Pam either. It is no accident both had their most successful parternship together, but Pam was a great doubles player who could win major titles with some others as well, just as Martina was of course.