Most hangers will tell you adding girth before length makes it more difficult to add tunica stretching gains. The reasons being a) the tunica becomes toughened from the stress (this was the Dr.'s point) and b) it's just logical that a thicker material is harder to stretch than a thinner one.
That being said, many people like myself won't be affected. I have ligament potential gains, plus I started with a fairly big penis. Someone who's like 5 inches might wanna lay off girth work if they're trying to be 8 inches, because their ligament stretch potential could stall out after say 1.5 inches and they still need to make up that other 1.5 inches with tunica stretching.
I wrote this original post before I did research on hanging. IMO, the most educated and serious Penis Enlargement practitioners are hangers so you guys should probably figure out where they share information and start gaining that knowledge... This thread is for like newbies so they don't start yanking on their cocks too hard at first or start pumping like crazy and toughen their shit.
That being said, my gradual theory applies to hanging. They start at low weight, cause micro tears, keep stretching those micro tears and try to get the most gains out of the lowest possible weight. The goal is not to see how much weight your cock can hang - the goal is not strength, it's size. So like a bodybuilder who trains til failure, you're trying to rip apart the tissue. Only diff is you don't give it any time to heal - you keep attacking it before it can heal so you can pull out those micro tears again. I think that's maybe what I was trying to get at when I originally wrote this, just didn't have the info yet to convey my concept.