The images below represent a definition of "Servant Leadership" that is diametrically opposed to the Vertical Development approach to Leadership because the over-reliance and emphasis on emotion is evidence of a millennial influence that assumes emotions are useful.
That is to say: emotions are assumed to be important. However, they are not as important as people assume. What IS important is one's capacity and capability to choose if they use or ignore an emotional context. The position of the Leader to be capable of choosing their construction of self far outweighs the limited view in the first image below.
Further to this, there are a lot of assumptions made by the researchers in the first image that demonstrate they have never heard of adult development, and as such, simply get things wrong. An example of how ill-conceived their position is can be seen in the paragraph below, taken from Stevens' 2020 thesis on Constructed Development Theory. In his research, he demonstrated that individuals are simply not as self-aware as they think they are, and this is represented in the grids below the first graphic that explains how Stevens thinks about "Servant Leader" as a framework.
Nelson, Kruglanski & Jost (1998) and Huntsinger & Clore (2012) demonstrate in their review of metacognition that the various sources of information made available when one tries to assess their self-knowledge and knowledge of others only really provides the ‘raw materials’ which then require interpretation in light of other implicit theories. This strongly contradicts the notion that we are in control of our thinking and behaving. It also emphasises that what we think we know is a result of a complex construction process (Lories, Dardenne & Yzerbyt, 1998).