I feel like JB and Michelle will try to "take over" as far as the couple is concerned. They already don't have "control" over Derick since he is a college grad, works for a regular company rather than in a business etc. Living on their property is a way of controlling them just a bit. I hope they live there and Derick treats it like any other living situation -- i.e. if they want to go away for a weekend or go on vacation or visit his mom or invite friends to visit, I hope they do just like any other newlywed couple. I think JB and Michelle will try to "separate" him a bit from his family -- they are large and overpowering in numbers, while he only has his mom who is ill and his brother. Somehow I don't see that happening though. Jill is in love with him and if he expresses to her that they really can't spend all their free time at the Duggars watching her bros/sisters being unruly because his mom is sick and he is worried, I can see her understanding that and spending time with him and his mom even if it cuts away from family church or whatever.
Unlike Chad, I don't see Derick wanting the unruly siblings to sleep over -- maybe it's because the Bates kids seem more well mannered than the Duggars, but I don't see him starting the "we'll take a few siblings every weekend" thing. I do see Jana, Jinger, Joy, Jessa hanging out there though -- but that would be more on a friend level and frankly good for them to see what a "normal" conservative man can be like.