I have worked under managers where you designate a point person for a project who can review and as a process mentor people.
But I have also worked under managers who have some kind of subconscious pressure to treat all reportees equal so they hesitate in even acknowledging that 2 people have different calibre and thus everyone either works independently or collaborates : so if you find something bad, you either fix it yourself and move on, but you don't talk about it (part of this is driven by the need to protect bad hiring decisions but if you do not mentor them you make things even worse a year down the line - ok this may be my bias showing up here but hey we are all biased) except in a weekly staff meeting where with many people and limited time you can cover very little.
So just curious what mechanisms do people set up to mentor people within a team without designating a reporting relationship?