I think Charlie leaving was a big signal, for those that didnt know, Boyd was working out of his kids shop during the show, because of the bankruptcy of the wheel company Boyd was left with little or no credit. Notice that they never had the parts they needed for a build and nobody would ship things without his ex cutting a check ? I have worked for people that ran their company like this, it is NO fun at all, it takes all the day to day business problems and amplifies them 10x. Notice how several of the big car builds for his buddy Scotty ended up at the next B-J auction ? small coincidence ? not exactly since they were hyped as TV show cars, rumor had it that Scotty put some money up front and they split on the back end. I saw through it early in the show but it always bugged me how Boyd pretended to be the simple hot rod builder.