To me, the important question is not, can our sleeve stretch or not. Seems like what we really want to know is, can we regain the weight? Unfortunately, the answer to that is, YES. Once you're several months out from surgery, you'll find that you don't have that much restriction when it comes to slider foods. You can easily consume enough low-quality, high-calorie foods in a day to gain weight, and to gain a LOT of weight. But if you use the post-op months to develop new habits, to change what and how you eat and not just how much to develop a new, healthier relationship with food, to find a form of exercise that you enjoy, you can be successful at this long term. Your new smaller stomach won't keep you from regaining weight, but it will help you be successful if you put in the effort, emphasize dense protein over slider foods, and sustain good habit.