It amazes me the amount of powerlifters and bodybuilders that think big muscles means they can fight. We had many come into various kickboxing and MMA gyms over the years. Some would even bring their girlfriends to watch them spar and rough us up. Time after Time these people would be knocked out, choked unconscious, or arm barred fairly easily in front of their girlfriends. There are many videos of buff guys getting dropped outside clubs by much smaller guys. Strength is only one component of what a fighter needs to master. Strength, conditioning, striking skill set, wrestling skill set, submission hold skill sets, reversal skill sets, maintaining dominant position skill set.
Weights don't hit back. Big muscles are false confidence.