I really don't know what's stopping Aldo from moving to 155 already. This has been in talks since he's come to the UFC, he's defended his title 4 times since then, his latest against Frankie Edgar, who one could argue lost a coin toss decision against Benson for the belt. Now he's fighting Pettis, the one guy who was going to challenge for the LW title. So now he'd have beaten Kenflo, Frankie and Pettis...pretty much earns himself a shot at the LW title if he wants it. If anyone has the chance to hold two titles in two dif weight classes it's Aldo at this moment. I also think his cardio would be much better at LW, so we wouldn't see the same Aldo who fought Edgar, but a much more energenic and durable Aldo.