So, Aaron was a brilliant dude, who did a lot of cool stuff. I just don't think the personality matches up, at all, with whoever created Bitcoin. If Swartz created a cryptocurrency, which I don't think he would have, I doubt it would look like Bitcoin. (There's also several people much higher on the list of "might be Satoshi".)
Nick Szabo. Mike Hearn. Hal Finney. Wei Dai.
Nick Szabo is a "former law school professor at George Washington University" according to Wikipedia.
Wei Dai has attended SIAI/MIRI workshops in person:
http://lesswrong.com/lw/ig9/outside_views_and_miris_fai_endg...
("Wei Dai" could be a pseudonym but if so I haven't seen him mention that on Less Wrong.)
http://www.aaronsw.com/weblog/squarezooko
...you can see his thoughts were more focused on censorship-resistance (a major interest of Swartz) than on stateless money.