Yes, the gap closed on its own. I just stopped wearing the retainer. Someone told me that all teeth tend to go to the front of your mouth if they have space, and sure enough, my molars on that side advanced towards my canine. They didn't come in full contact with my canine, but are close enough that the gap isn't visible anymore, though i can still stick my tongue in it.
I think my ortho did something like you mentioned. On my right side, where the extraction of the premolar took place, the teeth from the midline to my canine are pushed a little further back than those on my left side.
I have no idea what my ortho did... the whole procedure wasn't how it's supposed to go. But back then I didn't know anything about this subject. All I wanted was to fix my potruding canine, and that's the only thing I payed for. The whole thing was very cheap and I only wore braces for 6 months. She didn't even take x-rays of my mouth or anything. My dr. took them off and my front teeth still overlapped a little (like they used to) and I had the gap at the extraction site.
I remember I just went in, she did her business... we never talked about what was going on. I just expressed concern at one point were I had a gap between my front two teeth, I worried she would leave them that way, but she didn't.
So, molars hanging lower doesn't necessarily mean that your whole jaw is crooked? When I was analyzing my teeth and noticed this, I thought that maybe that was a sign that one side of my jaw was longer than the other.
Hey, I could share pictures of my mouth with you, so you can see what I'm talking about, lol. I could explain with words here forever, but, as they say, one picture is worth a thousand words. If you're interested in sharing pictures to gawk at eachother's "deformity", you could send me a private message to give me your e-mail.