You hit the nail on the head with that comparison, although I'd like to see McGhee's 40 time before his knee injury because he always seemed to pull away from everybody on the field. Even if he didn't have a sub 4.3 or 4.4, he had that football speed that some guys lose once the pads go on. Also, for some reason, Ronnie Brown doesn't look that muscular for a big back, ala Ricky Williams, Greg Jones, Eddie George, and Jamal Lewis. In fact, I saw a picture of McGhee and he looks a lot more muscular and compact then Ronnie Brown does.
I was going to mention how neither one was the main guy until an injury gave them an opportunity. The only difference is Ronnie went back to Auburn and went back to second fiddle to Carnell Williams whereas McGhee went Pro even though he blew out his knee.
McGhee is the real deal and will only get better when he finally gets back to 100%. Buffalo would be wise to get their O-line up to par. Ronnie Brown should be a very good back but I'd like to see him "do" something before I declare him the greatest thing since sliced bread, canned beer, and night baseball.
With that being said, as a Phin fan, I truly hope Ronnie Brown can improve his vision and use his speed to be the "Ricky Williams" that weed/insanity kept Ricky from becoming. If Ronnie can deliver then the sky is the limit with his physical attributes. Hopefully, he's not another multi-talented college back who turns into an NFL "jack of all trades, master of none" back.