Aregawi is not a front-runner. She will run on should of the lead runner. Simpson also will not lead but as always she positions herself well towards the front.
If the pace is to be fast it will have to come from someone else in the field.
Later in the season, when there are other girls who are in shape to run fast times and can set the pace, we will see Aregawi under 4 and perhaps Simpson as well.
Aregawi can run any type of race. She has run from the front and from the back, in the box. It depends on what she is trying to do. If she is going for a record she will jump in front.