Something is definitely off on the body to me with that Clubber statue, he seems a bit too tall and thick. Maybe if we had some comparison pics to go by it could be pinpointed, but something just seems off to me at first glance.
On Carl Weathers, I know Stallone did that first big Q&A on aintitcool where he took alot of shots at Weathers throughout the thing mentioning how he was impossible to work with on using him in Rocky Balboa. I think he said he originally wanted him to be in the movie and then later just wanted to use his old footage for flashbacks and Weathers was outrageous with his prices for both. Stallone also talked about how much better Lundgren was then Weathers and how weak and intimidated Weathers was for the fight scenes. Stallone seems to really dislike the guy now.