Hi,
I think I was one of the last few patients that had both the consult and surgery done with both Dr. O and Dr. D present. It was great and I liked the result, minus the prominent orbital rims. When I went I don't remember a consultation fee, and I don't remember the 3d scans being that much, but I could be wrong.
To answer more of your questions, I don't believe Dr. O does anything anymore, I had my stuff done the first time in 2015. Last time I saw Dr. D in March of this year, he just said, "yea he stops by every now and then", so can you ask if he can be present, of course, but will it happen, I don't know...especially since the practice is entirely Dr. D's now. When I went, Dr. O's name was still placed on various correspondents, now his name is no where on the sites. Although it does link to Dr. D site if you Google search Dr. O.
I would just call and ask if you can have them both present, for consult and procedure if you decide to have it done with them, and if they say yes, go for it. It would be a good move!