If people clearly pass the benchmark by a significant margin (e.g. 100%) there’s no need to wait for everyone else to finish the assessments. TfL does a lot of this ‘High Volume’ rolling recruitment, internally and externally.
It’s entirely possible for people to be at different stages.
Incidentally - and I’ve definitely said this before too - constantly posting for updates on a forum and getting angsty about the role isn’t going to help you. If you have other job opportunities you should always pursue them - TfL recruitment can be slow, and it may well be that the roles are filled internally anyway.
Similarly, as with most railway jobs, this is a role that commands a high level of patience. If you can’t demonstrate that in the application process this absolutely isn’t the job for you.