Sounds like a DS with pouch vs sleeve. Doesn't seem too out of the norm really, with your height/weight, the extra support from the DS should make a really decent impact.
I have reservations about your goal weight however. I don't see a Bypass DS hybrid is going to get you to lose 242 lbs, I'd be afraid that you'll get frustrated with such an ambitious goal weight. WLS has around a 60-65% excess body weight loss success. Meaning whatever your "Ideal" weight is, subtracted from your current total, then taking only 60-65% of that.
So, for a Female standing 5 foot 3, "Ideal" weight is 104-127. Your call out states you current weigh 407. So assuming the high end of "Ideal" your excess weight is 280. 65% of 280 is 182. You should expect to reach 225 as your 65% of your excess body weight goal. Anything beyond that is great, but don't set your sights on a weight that's really not feasible without plastic surgery.
By all means strive for the best possible outcome, just keep in mind a more realistic goal, because when you can't reach a goal, frustration and depression can set in and sabotage your process. Speaking from personal experience, I originally had 200 as my dream goal, knowing I'd have a hard time hitting it. I've gotten close, within 7 lbs of that goal, but it's just not happening, excess skin adds to total weight, and you can't eat or exercise extra skin away.