There are so many opinions lacking in sense in these forums. Anderson has fought at and said he could make 170 yet he fought at MW, became champion, and held it for a long time dominating fighters at their own game (KO'd Vitor, submitted Lutter). GSP's camp has suggested he fight at LW, yet he not only fights at WW but he is the champion and has been for a long time, typically dominating his opponents. Aldo is so big for his weight class he struggles to make weight, and all his victories have come at this weight division, against probably smaller fighters. If he moved up to a higher weight class and became champion how does that make him P4P against Anderson who toys with LHWs and makes them look stupid at their greatest strength (such as Bonnar's durability or Irvin's striking) yet can make WW and has fought there? If Aldo moved up to WW and became champion I would still give Anderson the edge, especially if it isn't against GSP. He would need to make other WWs look like they didn't belong in there for awhile before I would consider that. All this not to mention 'Anderson's age' and not using TRT.