As Alder's sourcing is very thorough and has much primary material, I wouldn't consider that he relied heavily on Rosen, though he values his summary of the Gribeauval System, stating on page 361, note 53, that 'the best summary of the Gribeauval System is Rosen...' I would have to agree that the summary is excellent.
As an interesting addendum, in note 52 Alder states that the Gribeauval carriages were heavier than the older ones they replaced because they used more iron than the old ones did. Gribeauval had pointed out that weight was only one factor in mobility-larger wheels, brass bushings for the wheel hubs, larger wheels all factored into the equation, making the Gribeauval gun carriages much more mobile. Rosen also points out that the length of recoil of the new field guns was not an issue, especially when it came to accuracy. Both Alder and Rosen make an excellent case for the modernity, usefulness, and excellence of the Gribeauval System. I would have to agree with them on all points that they make. The system was designed for a war of mobility and maneuver and did so excellently.