Tbh it's 2 situations that look similar but are completely different. Lynch was brought into Oakland to be the power RB in a committee, as well as a PR move to smooth the transition to Vegas, as he is an Oakland native who has the support of the community. Charles is just try-out player, w/no real expectations. As far as performance its obvious Lynch will do better. Not only does he not have a serious inj history, but he was also rated the #3 back in the NFL by PFF his final season despite averaging a little over 3 ypc, meaning the OL held him back. Now he has the best Guard/Center/Guard combo in the NFL blocking for him, which works perfectly for what he does; power running between the tackles. Throw in the dynamic passing game that prevents defenses from loading the box, and Lynch is set up for a career season. Charles literally has none of that in Denver, so even if he wasn't coming back from serious inj a resurgence there would be highly unlikely, and their salaries reflect that.