Why your best performer may not be your best leader

One of the most common and costly decisions organisations make is promoting their strongest specialist into a leadership role and discovering, too late, that the skills that made them exceptional in one role are not the skills that leadership demands.

It is an easy mistake to make. High performance is visible, measurable and reassuring. It feels like a reliable signal of potential, but performance in a specialist role and potential for leadership are two fundamentally different things and confusing them is one of the most persistent and expensive mistakes organisations make.

Two different roles, two different capability sets

A high-performing specialist succeeds through deep expertise, individual contribution and personal excellence. A leader succeeds through something entirely different – the ability to create the conditions for collective performance, develop others and make decisions that balance short-term results with long-term organisational health. These are not simply more advanced versions of the same skills. They are a different kind of skill altogether. And yet, organisations routinely assume that someone who excels at one will naturally excel at the other.

Research consistently confirms what experienced leaders already know: only around 30% of high performers also have high leadership potential. The remaining 70% are likely to thrive in roles that build on their existing strengths, but may struggle and cause others to struggle when placed in positions that demand a fundamentally different capability set.

The cost of getting it wrong is rarely visible immediately

When a leadership appointment is not the right fit, the consequences tend to emerge gradually. Performance dips. Team dynamics shift. Talented people become disengaged or leave. The new leader, often aware that something is not working, but unsure what, may retreat into doing rather than leading – reverting to the specialist behaviours that brought them success before.

This is not a failure of character or commitment. It is a failure of fit and often, a failure of preparation. The organisation promoted without fully understanding what the role required, whether the individual was ready for it and what support would be needed to make the transition successful. By the time the consequences become visible, the cost – in performance, in team morale, in recruitment and in lost time – is already high.

Potential looks different from performance

Identifying genuine leadership potential requires looking beyond what someone has achieved in their current role. It means understanding how they think, how they relate to others, how they respond to ambiguity and pressure, and whether they have the capacity and the genuine desire to lead.

Some of the most important questions worth exploring before a leadership appointment include:

• How do they respond when faced with unfamiliar situations, greater complexity or challenges beyond their current expertise?
• How do they contribute to the performance and development of others, beyond their own individual contribution?
• How do they respond when they don't have the answer or cannot rely on their own expertise?
• How do they respond to feedback, navigate conflict and manage relationships under pressure?
• What genuinely motivates them to lead and how do they understand the responsibility that comes with the role?

These questions cannot be answered by reviewing performance data alone. They require a different kind of inquiry – one that goes beneath the surface of what someone does to understand how and why they do it.

Better understanding changes the quality of the decision

The most effective leadership appointments are not made based on performance history alone. They are made on the basis of a genuine understanding of the whole person – their strengths, their development areas, their motivational drivers and their readiness for the specific demands of the role.

A more structured exploration adds value by creating clarity before a decision is made. It helps the organisation understand the person in relation to the specific demands of the role and helps the individual understand themselves more deeply. If the appointment proceeds, the transition can then be built on greater self-awareness and a clearer understanding of where support or development may be needed.

A successful leadership appointment requires more than talent. It requires understanding – understanding the role, understanding the person and understanding the fit between the two.