While "most" is an incredible exaggeration, there are a few guys in the WWE who would have more than a fighting chance against Conor, certainly more than some in this thread are willing to credit them for. As mentioned previously, Dolph Ziggler and Jack Swagger both have high level collegiate wrestling experience and are both much bigger than Conor. Jack Swagger would dwarf Conor, he's 4 inches taller than Brock and about as heavy.
That's just two guys as well. There are wrestlers in WWE with MMA experience (Alberto Del Rio, Shinsuke Nakamura), ammy MMA experience (Baron Corbin), more collegiate wrestlers (Chad Gable, Jason Jordan). There are also guys on the main roster who are tall enough that Conor would probably have a hard time even reaching their head to hit them (Big Show, Kane, Undertaker, Braun Strowman, Luke Gallows etc).
Any of these guys would probably get massacred by a fighter of equal weight, barring some freak punch or something, but Conor is about 3 divisions below most of them at best. He could probably put any of them to sleep given the chance, and I don't know if I'd even necessarily favor any of them against him, but pretending he'd walk through all of them easily is rather silly.
