Ok, I have 2 DDs at SHS and no more DCs to go through the system but I'm going to throw in my two pennies worth. Perhaps a bit controversial and I may be proved wrong come March but as a mum of girls I would offer the following as a possibility:
Traditionally those parents looking at the Gloucester girls grammars will share with both HSFG & Ribston. This being the case, I would suggest that this year, MOST would have asked to share with Crypt too (why wouldn't most people with competition for spaces being so great!).
If as we think there are many girls in the top 150 ranking for Crypt, my guess is that these girls have also got qualifying scores for HSFG and Ribston and, unless there is a massive difference in capability between girls and boys at this age, then most of the girls in the top 150 for Crypt will have excellent ranks for HSFG and Ribston (and indeed Pates and SHS if shared with them too).
Now, it is my view (shoot me down in flames if you think me wrong) that many of these top ranking girls will opt for the traditional HSFG or Ribston or Pates. Some won't of course - brothers already at Crypt or a desire for co-ed if not Pates qualified.
Upshot is, in my humble opinion, come March the rank of the last girl/boy offered a place at Crypt will be way down the order.
If I'm right then this would be good for boys lower down the order who want Crypt. The only unknown is how many girls are in the mid to low rankings for Crypt and who did not get a good rank for either HSFG and Ribston will be offered and accept places at Crypt.
Right, now I'll run for cover!

That is one way to look at it. A more pessimistic way may be there are 200 girls qualified, but most are in the top 150... the discrepancy between Crypt and Tommies ranks would suggest there are a good few girls in the higher places. But of course all conjecture..

Ok, I have 2 DDs at SHS and no more DCs to go through the system but I'm going to throw in my two pennies worth. Perhaps a bit controversial and I may be proved wrong come March but as a mum of girls I would offer the following as a possibility:
Traditionally those parents looking at the Gloucester girls grammars will share with both HSFG & Ribston. This being the case, I would suggest that this year, MOST would have asked to share with Crypt too (why wouldn't most people with competition for spaces being so great!).
If as we think there are many girls in the top 150 ranking for Crypt, my guess is that these girls have also got qualifying scores for HSFG and Ribston and, unless there is a massive difference in capability between girls and boys at this age, then most of the girls in the top 150 for Crypt will have excellent ranks for HSFG and Ribston (and indeed Pates and SHS if shared with them too).
Now, it is my view (shoot me down in flames if you think me wrong) that many of these top ranking girls will opt for the traditional HSFG or Ribston or Pates. Some won't of course - brothers already at Crypt or a desire for co-ed if not Pates qualified.
Upshot is, in my humble opinion, come March the rank of the last girl/boy offered a place at Crypt will be way down the order.
If I'm right then this would be good for boys lower down the order who want Crypt. The only unknown is how many girls are in the mid to low rankings for Crypt and who did not get a good rank for either HSFG and Ribston will be offered and accept places at Crypt.
Right, now I'll run for cover!

Our Crypt email said 1819 chose to share their results not 1700. I don't understand the discrepancy in ranks for different schs tho. When I got the Crypt rank 1st & it was just over 200 I was sure he'd not ranked in top 150 for Tommies or ranked for Pates so was really surprised when he did. Crypt is becoming more & more popular & we've seen a definite trend at our junior school over the last few yrs to choose it over Pates & Tommies even tho strs is closer.

All good stuff - well done for putting your two pennies worth in. Just want to qualify your last point though - as my daughter got reasonably safe rankings for Ribston and SHS but failed to qualify for Crypt that scenario probably cannot exist.

FWIW my hunch here is that Crypt understandably have no idea what to expect and therefore ranked down low. So while it may appear on the face of it that it is 'harder' to get into Crypt than Tommies this year, I would be really surprised if that turns out to be the case in reality and that lower ranked boys at Crypt will get places because more of the higher ranked ones will choose Tommies. STR has been the harder to get into by some margin for years and I cannot think that the Crypt decision to allow girls in is going to affect that, but they are feeling their way as they have absolutely no sense of how appealing they will be to the female applicants.