I know they got rid of quite a few drivers at the FlixBus ops in Aberdeen, that weren’t up to the job. That’s isn’t that unusual with ‘coach‘ drivers, especially where drivers have moved over from ‘bus’ work, as they can be quite different jobs and many drivers can be really good at one but not the other. I have also heard that some early Ember recruits have also moved on.
The fact that a few new options have appeared this year for driving jobs in Aberdeen will certainly have had an influence on the incumbent operators like First and Stagecoach.
I was speaking to one of the ember drivers recently and they were full of praise for how professional the operation was compared to what they'd experienced elsewhere.
Based on my experience with ember drivers generally, it seems they employ only those with the ability to interact positively with passengers - something which a good number of the First and Stagecoach drivers have difficulty with.