Increased density application for a new well

There is a lot of activity in this section all of a sudden. 21-6-4 McClain County That is good! I received an increased density application for a new well only in this section (21) for the Deese Common Source. In the application it states, “Applicant does not believe the existing well can adequately and efficiently develop the entire unit…”. Question: What “existing” well are they speaking of? As far as I know, there are no wells in this section that are operating in the Deese CSOS. Also, all wells in this section include both 21 and 28. Why only a single well in 21 and not both 21& 28? Just seems odd.