The statement presents the theme of how Balboa was a great representative of the Spanish crown. It also shows the theme that it was his work that stimulated Spanish dominance in the new world. These two themes are connected because Balboa was a Spanish explorer
You have not provided the text that this question refers to. This prevents me to show you a specific answer. However, through the context of your question, we can see that it refers to Vasco Núñez de Balboa and his work in the new world.
In this case, we can say that:
In this case, it is possible to see that the sentence "As he moves, the shadow of Spain moves with him" reinforces the importance he had for Spain. Showing that Spain had a great benefit in the work he started.
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