(Neji Hyuuga has a different bloodline (360* vision among other visual improvements, but no instantly learning abilities); Shikamaru Nara is an intelligent individual but also doesn't have this ability; Kidomaru has nothing like this at all.)
The ability to understand and master abilities intuitively. A variaion of Intuitive Aptitude.
By seeing an ability at work, the user can intuitively understand how it works, how to control it, and how to master it. The user can teach others how to control their abilities once seeing their power. Alternatively the user can also be able to develop a countermeasure if they understand an ability long enough to figure out it's weaknesses.