I wish I had saved the email response from TD Ameritrade when I asked why their L2 feed did not include DRCO and that DRCO was a very active MM on DPDW.
They said they had no control over what MMs were included in their feed since it was provided by a third party and that DRCO was not a significant volume trader of DPDW.
I just sent them a recap of our communication and a link to the page in you post suggesting the possibility that one of us was incorrect about DRCO/DPDW.
Their anticipated warm and fuzzy response may reveal how much they value my account relationship. [sarcasm font] I'm all a-twitter with anticipation [/sarcasm font], LOL ;-)