In an interview with Sherdog radio, Firas Zahabi, UFC Welterweight Champion Georges St-Pierre's head trainer, said a move to 155 was more likely than a move to 185 for the French-Canadian superstar.
Now granted, this is simply speculative. Zahabi also mentioned that a move to 155 is far less likely with Frankie Edgar holding the belt.
The reason being is that both GSP and Edgar train Brazilian jiu jitsu under Renzo Gracie, so obviously these two have trained with each other on many occasions and would like to avoid each other in the Octagon if possible.
So, while fully acknowledging the fact that this fight may very well never happen, here are four reasons why Georges "Rush" St-Pierre would definitively defeat Frankie "The Answer" Edgar.
Frankie Edgar is used to being the smaller man in the cage, given that he walks around at about 160 pounds.
However, even with inevitably losing some muscle mass, GSP would be bigger and stronger than anyone Edgar has ever encountered at lightweight before.
Edgar's previous encounters with Gray Maynard should not be ignored, but the strength and size difference here is a big deal since St-Pierre brings intangibles to the Octagon that "The Bully" does not.
Frankie Edgar comes from a high wrestling pedigree, going to the nationals all four years that he wrestled at the Clarion University of Pennsylvania (a Division I school).
This has shown with his great takedowns and solid takedown defense throughout his MMA career. However, despite having no wrestling experience in high school or college, GSP has arguably the best takedowns and takedown defense in the entire sport.
St-Pierre's explosiveness, power and crisp technique make his shot nearly impossible to stop.
His takedown defense is no less impressive, as former four-time Division I All-American (and one-time national champ) Josh Koscheck only got GSP down to the mat once in their second meeting at UFC 124.
GSP has also gotten the better of high level wrestlers in Jon Fitch, Sean Sherk and Matt Hughes.
Frankie Edgar's boxing is very quick and precise. Out striking BJ Penn is the best example of how effective The Answer's hands are.
As a matter of fact, it seems completely reasonable to say that Edgar would have the boxing advantage against St-Pierre.
However, GSP is the all around better striker. He will have far better KO power than Edgar at 155 pounds and is better at mixing kicks into his offensive attack.
For a fun fact, GSP, a guy constantly criticized for not finishing fights, has a higher percentage of wins by knockout than Edgar does.
GSP has 22 professional victories and eight by knockout, which translates to about a 36 percent KO rate. Edgar has three KOs in 14 career wins, for a knockout rate of about 21 percent.
While it's been quite some time since fans have seen St-Pierre look vicious from the top position, the way he manhandles opponents after the takedown is something that needs to be acknowledged.
The one and only time Edgar lost was when a high level wrestler was able to take him down and hold him there.
Granted that was for three rounds, so could St-Pierre do it for five? Maybe, maybe not, but the chances of Edgar sweeping or submitting the BJJ black belt would be slim to none.
Edgar's grappling acumen, along with his iron will, would probably allow him to scramble back to his feet on more than one occasion after getting taken down.
However, that is not going to stop the problems St-Pierre presents on the feet.
Edgar would make GSP work and could probably draw an entertaining fight out of St-Pierre for the first time in a while, but the New Jersey native would not stand much of a chance against a 155-pound Georges St-Pierre (assuming he can make the weight in a healthy fashion).