I have not had my surgery yet, but I do fear the scar tissue issues as my body does seem to build a lot of excessive scar tissue lately. I have one skin that give me daily pain from a fall with a bad scrape, where I now have massive scar tissue adhesions all down my shin that limit my walking. I also have one arm I can no longer do blood tests in as each test has formed massive scar clots like mini-tumors at every pin prick. Will likely have to get a vein graft one day to keep flow to my hand. So I am a bit paranoid to have any kind of major surgery, in case it ends up causing strictures, etc. I am leaning more towards the bypass at the moment, but am still undecided. I have a long wait for mine -- likely wont be until the early spring so lots of time for research etc.
Hope you find the answers you need, and that you have success with whatever new surgery you go to.