Hi and welcome Spook! I"m newbie to all this so I hope those with more experience join the conversation soon but here's my 1c for what it is worth!
5yr8m is on the young side for the WISCIV. The scores could be heavily influenced by his age, how he interacted w/ the tester, was the tester trained in testing gifted kids, etc.
I would say if his grade skipping is based on performance and achievement, then he should be fine. I think work ethic and motivation and personality has a larger role to play than IQ.
I say if he seems happy and teacher says he is solidly in the middle of the pack or above (not struggling at the bottom) then it sounds like he is well placed!
