For his own good, I think it would be best if he gets a tune-up match, but I, as a fan, want to see this fight happen ASAP! Like someone else mentioned, if GSP loses, I don't want to hear people say he wasn't acclimated to the weight, etc., etc... I think the size difference will play a huge part in moving up to 185. I think we can all see that GSP is physically maxed out for 170, but at the same time, he will make a small 185 mainly because most of those guys basically walk around at 200+ pounds (Andy at 220 I believe) while GSP probably walks around barely at 190. For GSP to get up to that weight and still be able to dominate people in wrestling will be a feat in itself, in my opinion. I think if he is able to succeed at 185, his stand-up will make the most difference at 185 than his wrestling.