I understand it's a hypothetical, but there are too many "if's." I happen to believe Aldo will beat Edgar and may even catch him clean enough to KO him, but Edgar is quick and dodgy enough to avoid a lot of damage. (That said, Edgar has been caught by Maynard and Bendo, but he survived. Aldo is a better finisher than either.) So, we are probably going to get a relatively close fight, 49-45 Aldo.
Aldo moving up mostly depends on how the weight cut goes. It is getting tougher for him and he is planning to try a different method. If that works and he makes it easily, then I say he stays at FW to at least face two more contenders.