My cousin who is 40 who has CD had a resection in 2011 where they took her appendix and 5 inches of illium and the valve. Since day one after the surgery, she never had problems with D or another symptom from her CD. To this day she feels the best she has in years and can eat anything she wants (but doesn't) The only drug she takes is pentassa and she follows the SCD diet like I do, but not to the 100% adherence like I do.
The one thing that impressed me a lot with her surgeon was that he had a pathologist in the OR with him at the time of the surgery to analyze samples of tissue in real-time from her intestine and colon as he cut out pieces. He did this so he knew for sure he was getting all of the crohns infected intestine, and NOT leaving anything behind to flare up afterwards, but also so he didn't take out way more intestine then he really had to so that there would be less problems with BMs afterwards. the surgery was done laparoscopically too.
Many surgeons think they know it all and just cut what they see with there eyes , not really knowing for sure if they get everything. Others cut way more then they really need too just to be safe but not thinking of the patient and what problems he will have in the futur with a lot of intestine removed.
If I were you, I would insist on a pathologist in the OR with your surgeon who can analyze the intestine removed in real-time so he can tell the surgeon when he sees no more CD infected tissue so the surgeon will know for sure he got it all.