This is because theories are broad in nature and they explain larger bodies of data. So if our research question is really original then we may need to collect some data and make some observations before we can develop a broader theory.
While I do realize that text mentions that a hypothesis and a theory are different, I don’t understand why? In my head these two things are the same because we would still have to test them to find the answer. Therefore, I don’t think I understand how to differentiate the two concepts from one another.