I like the tips you’ve given. The last one, “who do you love?” seems a bit out of place. “Investment” is often connected to results or outcomes. If would seem that if a mentor is invested in the outcome or result of his/her mentoring then that could act as a barrier to the protege becoming more than the mentor. The mentor might have difficulty recognizing what “becoming more” is and instead think the protege is “wrong” or taking too long to produce desired results. I’d say a better alternative is for the mentor to care about the protege in the here and now; that is, when they are together or interacting the mentor demonstrates his/her caring through the relationship and not through concern about the outcome of the relationship.