I met a man who was over 800lbs and he had the full DS in 1 OP. Rabkins/Baltasar have done the DS LAP in patients over 600lbs. Unless you are in terrible shape, and you will know if this is you, there is no reason to do the OP in 2 separate surgeries. If your surgeon does not have the SKILLS to do this, I would look for another surgeon or suggest he have another surgeon assist him/her. Gagner wrote about this and he prefers to do 2 ops. PREFERS...meaning it's easier for him. He gets paid twice and the patient has to go through this whole thing twice. Plus there is a chance after the patient gets the sleeve, they will be denied the switch by their insurance company. This has happened multiple times.
Now let's talk about synergy. No one knows for sure why but 1 OP patients lose more, faster, than the 2 OP patients. And it's easier. They don't have to work quite as hard to lose the weight. There are 2 OP patients who made it to goal so it's not impossible. But your best chance is 1 surgery, not 2. There is something about having it all done at once that makes it more effective. I think it was
@DianaCox who first used the word synergy and she was exactly right! It just works better when it's done all at once.
Here's yet another alternative. Get the band removed now. Some docs will do this in their office. Not a big deal and you have an owie for a couple days. Wait a few weeks, then have the whole DS. Honestly, band removal is usually an easy straightforward procedure. It doesn't take a long time and in the big scheme of things, it should have no bearing on your ability to be under anesthesia for the DS. This is just so you know there is an alternative.