I know a lot of people will disagree with this, but I personally do not think Jeremy is the submissive one in the relationship. Sure, DB, does most of the talking, but I think Jeremy makes most of the actual decisions, especially with regard to the defense 'team.' When Cyndy Short was fired from the case, a reporter asked DB about it and DB said 'news to me.' Later a statement was released that the decision had been made by the family to fire CS from the team--I think that decision was made by Jeremy in consultation with Tacopina. Jeremy is the bread winner and pays the bills, and I would guess that he keeps DB on a pretty tight leash financially. (It's my theory that PN actually paid for the box of wine as a treat for DB.)
Other items that contribute to my reasoning (there are other things as well, but I'm a bit pressed on time today): the parents stopped cooperating with LE after Jeremy had a blow up with them. Jeremy's parents had apparently been completely cut out of Jeremy's life prior to Lisa going missing, to the extent that they filed for grandparents' visitation for Lisa's brother. I am not 100% sure of the timeline, but I believe that was going on before DB even entered the picture. Jeremy had fought for and obtained full custody of his son with RR years before he had a child with DB--that took a lot of determination.
All of these things lead me to think that Jeremy is NOT being led by the nose by DB--I think in fact he is calling the shots and pulling the strings behind the scenes. MOO.