While I think many people who meet BPD criteria by DSM-5 are a subset of those with ADHD, I have also worked with a number of individuals who fit the BPD criteria but don't show any trace of inattention, distractibility, directing focus, sustaining effort, planning, or organization in their day to day lives. These individuals don't seem to be on the ADHD spectrum, and all that I have worked with have had major histories of childhood emotional neglect and invalidation.