Contextual overview
Training should account for the 'strength gap' when transitioning from general gym work to the mat. While grapplers are stronger than the general population, the sport-specific 'Gi grip' is mechanically less efficient for force production than a standard handle, emphasizing the need for specific grip training.
Original publication abstract
This 2023 study by Escobar-Molina et al., published in Frontiers in Sports and Active Living, investigated how different grip types (standard vs. combat-specific) affect maximal force and the 'bilateral deficit' in 73 subjects (including 42 grapplers). Results showed that grapplers produce significantly higher force with a standard grip than with a sport-specific (Judogi) grip, though grapplers still outperformed non-grapplers in both types.
Check the original article for the population, device, protocol and limitations before applying its results to a different configuration.