It'll probably sound trite, but "talent" comes more from the "soul" than anything. If you have the ability to feel, imagine, and react to music on an emotional level, then you can be "trained" to do everything else to one degree or another.
Talent, when it comes to guitar playing, can be taught, whereas soul is innate.
Nothing in this world is innate. Everything must originate and is affected by prior occurrences.
It also applies to birth. For example, on a superficial yet easy to understand level, if a pregnant mother were to execute <EventA> then the baby will be affected and be born with 'musical talent'. On the other hand if <EventB> was executed then the baby may not have 'musical talent'. Thus talent is not 'innate' in this sense.
Therefore talent or "soul" must be able to be developed.
Properties of an individual will determine 'talent', and to my defination is a "term depicting a high level of ability to satisfy the purpose(s) of music."
'High level' is subjective.
The purpose of music is subjective.
It is just difficult to identify the necessary steps to alter the properties of an individual making them 'talented'.
Furthermore I don't think emotion is necessary for the production of 'good' music. It is only emotion that drives humans through very complex still scientifically unknown proccesses to perform in a particular way.
For example, a robot may be able to replicate the exact movements of a master guitarist and if you were to just listen to the recording. You wouldn't know who played it. Last time I checked robots don't have emotions.