Monkey King or Sun Wukong well mentors Mk! He never really try to teach Mk something that Mk can't handle not had he trained Mk to the point Mk is injured one way or the other because sure Mk is 24 or 25....legally in human years atleast but no one knows his real age BUT that's still a baby to celestial years.... Plus mk has enough trauma and problems for someone so young That little issue was formerly balanced out a year or two ago but then Macaque who also mentors Mk albeit rarely gone softer on the training almost as Wukong's training is so.... What's the point? Usually Wukong would've just kicked Mac off the role of being Mk's second mentor but Mac is kinda actually part of the gang now and they're kinda... Ok now..... But it's still a bit of a problem how Mk's.... Power progresses slower than his sudden bursts of power or new power he gets.... Which causes another problem! Mk's a ticking time bomb and teaching him more might be a shitty or the greatest idea ever Mac does not help deciding what to do in that matter though much to Wukong's dismay