GSP isn't going to fight at 185 any more IF he were to come out of retirement again. GSP was not able to add the weight comfortably in 2017 for the Bisping fight and had digestive issues resulting from the effort to bulk-up. I do think GSP wanted the Khabib fight at 155 for a chance at triple-champ or a basic catch-weight super fight for big $$$. A super fight with McGregor for big $$$ is no longer an option now that McGregor has been exposed as just another guy at 155. If you've seen recent pictures of GSP walking around and compare them to recent photos of current MW fighters walking around, the height and weight differential is pretty obvious. GSP is much better suited to LW or WW IMO. Father Time is undefeated and a very cruel bastard. GSP is still a talented well-rounded fighter, but reaction time and quickness do fade with age, so GSP at just two months shy of 40 is getting towards the end of the line if he wants to fight one last comeback fight.