The process is as fair as it can be; those only see differently when it doesn't go in their favour. I can state as an absolute incontrovertible fact that nepotism plays no part in the selection process, and it's the continuing excellent work of LC that ensures that. If you tick all the boxes and there is a continuing requirement then job done.
With all due respect, those in the hold pool have no real idea where they sit and as such aren't in the best position to claim otherwise. It is true that those who received the call sat part of the selection process again.
Rest assured that those with minibus TRs will have been treated fairly and equally. That is one aspect of the process you can, with certainty, hang your hat on. Keep the faith.