Why do some Managers always have low attrition

A lot of times I get asked about how some team managers consistently have lower attrition than their peers.
I believe that its a combination of many things. There are factors that managers may not be able to control such as project dynamics, office location, learning opportunities etc. Having said that, there are clear traits that make some managers stand out from the crowd.

Do let me know if I have missed out any other traits that you feel make these manager stand out. I look forward to your views.