This was one of my concerns about modified LeFort 3 in the private forum. There is no bony overlap in these kinds of movements, hence distances that can be moved are small. Plus, over 30 bones don't heal that well. Risks for notch and periodontal defects are known to notably increase after 25-30. Surgeon will have to go back in and try and graft it to get it to close. Hopefully the graft materials will stay out of the sinus cavity and you don't start getting infections in there. These things happen but you'll very probably be ok.