It's seriously time for the man to move up, he could start by challenging Ben Hendo. Really, that'd probably be toe to toe, same size. The last thing I want to see is another 5-round fight winner in the UFC holding the belt (Edgar/Maynard). Aldo is a nightmare match-up for anyone if he moves up.
Aldo's not a guy that'll get laid and prayed upon and engulfed Fitch style, he's too dynamic, athletic and quick Machida-esque TDD to make guys pay for trying.
Compared to Edgar, Aldo - zero times taken down in his career (so they say), hits harder, bigger fighter, faster fighter, throws kicks as fast as Edgar punches, full torque kicks are mountain movers, and definitely more athletic.