As you draft the personal statement, you’ll be working to include certain details, attributes, or previous experiences – and at the same time, you’ll be working to create the free space to include those new parts. That will necessarily lead to an ebb-and-flow of different content. As you get different reviews and types of feedback from different people, you might find that the draft you’re working on has become disjointed. You may have managed to include all the different topics that you wanted to, but at the expense of the narrative, or the ease with which someone can now read through.
You therefore need to spend time on the structure, and on creating threads that take the reader from the introduction through to the conclusion. The very best personal statements will seem less like disjointed sections, and more like a cohesive whole, through which we can get a true sense of the individual writing.