First of all, kudos on working hard to build your physique up, after you lost the weight. Also kudos for losing the weight - I know some here argue that the surgery means you cheated, but the bottom line is you did something about your situation and improved your life dramatically.
I have to tell you that I am floored by the result your surgery - almost to the point where I doubt that this is really you. The outcome is just stellar. I had never heard of this procedure before, but googled online and this is the second image that popped up...

Now, that clearly is a clusterfuck - and I'm not sure that clusterfuck even describes this. Hell, I'm not even sure what the fuck it is that I'm looking at there.
I'm not sure if your results are typical or what, but if they aren't, you seem to have been very lucky and if they are, plastic surgery seems to have advanced tremendously.
Perhaps it might have not been as bad, but I think there's a limit beyond which the skin is just perma-fucked. I imagine its a combination of how much it was stretched and how long it was stretched for.
Thanks! I don't know if my results are typical...I know that my surgeon for the WLS as well as the skin have profited tremendously off of me (and I haven't seen a dime in it). Sometimes it pisses me off that they've labeled me the "poster child" for WLS and the like, and people get their hopes up looking at my results then put in zero effort comparatively speaking and then they're left looking like that picture above.
The pictures are somewhat smoke and mirrors, because you can still see I have loose skin around my gut, even with the surgery. The surgeon equated it to stretching a shirt...when you're standing upright, it's tight, but when you lean over, the area from top to bottom has lessened, thus creating more fabric. Does that make sense?
You can see in this picture here that although my abs are visible, the skin still flows over them...
To clarify the difference in the typical results from gastric bypass vs going beyond, the first picture on the left in the middle row is essentially what I looked like after WLS and would've remained looking like had I not started bodybuilding (cleaned up diet, lifted 6 days per week). It took forever, but I was able to change from that picture to now.
I will say though, I think I have somewhat screwed myself in following the traditional 'bulking/off season' and precontest dieting because I have started to stretch the skin back out. I don't have an HGH gut ha, but I can tell the difference by gaining and losing year after year...