If Chris did not have his muscle reduction, he could have been able to save Finn...sorta.
In 5, Chris had the man-power to punch a large boulder into lava (ignoring the fact he also had the man-power to survive volcanic heat).
So, if Chris still had his muscles, he could have boulder punched the first gate to get to Finn and them. Boulder punched them before they could transform. Boulder punched Carla into a wall. Then Boulder punch Piers...just for the hell of it.
Then he would become crazy, due to his massive punching power! Then become the antagonist for the next RE game.
Resident Evil 7: Rise of The Boulder Punchers
Okay...maybe I took this idea further than expected.