I would have questions about the PSI as well. A related notable pair of numbers is BD and VP, which are the two subtests that comprise the Visual Spatial Index. He scored in the center of the Average range on BD, which is a motor-involved task, and in the Very Superior range on the related motor-free task (VP, 98th %ile). That is a two SD difference between the two, with the weaker performance on the motor-involved task, suggesting that the VSI is not an accurate reflection of his perceptual skills, in the absence of motor interference. If there is a challenge in the fine-motor area, the tasks that would be expected to be impacted are BD, CD, and SS--which happen to be his lowest three subtests.
There is no WMI because Picture Span was not administered, which would have been necessary to compute WMI, but is not necessary for the FSIQ. I'm guessing that SS (the second PSI subtest) was administered because of the low CD score.
He probably did better on the KBIT-2 nonverbal because it is motor-free. It's more in line with his VP score. The KBIT-2 verbal is most like the VC subtest from the WISC-V, as it is mostly vocabulary and general knowledge, and is also consistent across the two tests.
In your place, I might want to know if the lower BD score was because of accuracy or speed (bonus points for speed can be a factor for some students, though it's not as much of an issue for seven-year-olds), and what kinds of errors he made on BD, CD, and SS: reversals, distortions of the figure, breakdowns in the overall form of the structure, etc.
Do you otherwise have concerns about his speed or accuracy with fine-motor tasks, like drawing, writing, tying shoelaces, etc? Has his vision been checked? An evaluation by an occupational therapist might also give you more information.
