What do you know about a subject before taking it in your course? What do you know about the feel of driving your dream car without getting in one and really driving it? What do you know about the terrain and the taste of firmness on the ground while climbing a mountain, without stepping on one? What do you know about the potential of a person in your team without assigning that task, job or a challenge and letting them perform at their best?
Potential of a person can be seen through their willingness to perform, ability to learn, adaptability to changes, ability to work with ambiguity, ability to provide clarity in the context of complexity, ability to work with the resources available and ability to challenge the status-quo subtly by results than talk.
You will be able to identify high-potential people in the team easily. If you have to put a lot of effort to find it, maybe you are looking at a wrong person or using a wrong lens. Change the frame-of-reference from what they are doing today or what they did yesterday, to how they will be doing the next level task. You will see the best in people. But to nurture that, you need to get this potential show-up in regular work. Treat them the way they will be functioning at the next level. You may be pleasantly surprised with how they perform.
When we treat man as he is, we make him worse than he is; when we treat him as if he already were what he potentially could be, we make him what he should be.
~ Johanna Wolfgang von Goethe
People who are willing to perform will always find a way to deliver the best results irrespective of their capability and context. You should make yourself assume/accept challenges of doing what you have not done so far, routinely and deliver the best. As an intrapreneur, you will need your potential converted to kinetic act and have the ability to find and make-use-of potential of others too. This makes you resourceful and effective. Your craft becomes remarkable.