Okay now I know which school I can be more help. Friends DS went there and were very happy and I know others who have opted for it despite getting high enough scores for Pates and STRs because of location and the ethos.
So there will be people from Cheltenham who will have ticked for Crypt as a back-up but if they get a high score will go to Pates. Sir Thomas Riches is also historically harder to get into so some will have ticked Crypt as back up but chose to go there.
Also some on the Stroud borders will opt for Marling Grammar as it is closer and they may prefer it.
To sum up your DS has passed and it is a good school and highly likely that in March on offers day he will get offered a place there.
My youngest is shy and had to start at a new school last year without his brother for the first time. He loves it. I am sure your boy will be fine once he gets there too.