The legal requirement to be 'incharge' of an aircraft is a years flying experience.
In my opinion (and it is only my opinion) an individual is promoted on merit and ability to be able to perform to the required standard in that particular role.
I have flown with thousands over a long career in the industry. Yes, i have come across people who were nowhere near ready to step into a role with that kind of responsibility in such a short period of time. Equally, i have flown with people who have displayed ALL the skills necessary and more. The role of CSD is not just about flying experience, but the ability to manage effectively, evaluate situations and make decisions, lead a team and be a role model.....some of these qualities are obtained through life experience and not just flying.
At least give the person concerned the chance to prove themselves as effective prior to shooting the decision to promote them down in flames. Your 'friend' might just be suprised at their ability and if their not, there are always the correct channels to go through to voice your concerns.
Safe flying to all