Might just be better people than you applying. If they had any sense then they’d sift out the strongest candidates from the weakest and then see how the stronger do going forward while having other people to fall back on in case they’re not as good when they progress through each stage.
That's not really how it works. It's pass/fail, so you're either good enough or you're not. There is no 'league table' of applicants based on their individual scoring.
They are prioritising depots that will have larger or earlier intake dates first, and they only have a certain capacity for each stage depending on where you sit testing etc
I think someone pointed out earlier that this section is entirely ran by OPC until after CBI, so that's probably 2 or 3 people (out of around 12) that will be checking scores, setting up sending out next stage emails, then sending results and the next next stage emails etc. They deal with a number of TOCs/FOCs concurrently, probably thousands of applicants for each recruitment or even each depot. It does take time, but you will receive a response in due course be that positive or negative.