If the talent development is working correctly, there should be many candidates gaining more skills and experience. Having multiple people prepared to move up provides you with a better pool of candidates to choose from to fill the position. It is always better to have a surplus of options, than to be left with none.
Be sure to balance the competition well because if too many candidates have to compete against each other for the same position, the employees may feel frustrated and leave if they do not get the position. To avoid this you may want to train them for other divisions and provide with them choices as well.
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