All respect but this is a bit goofy.
DC could barely get past Gus and lost to Jones twice - literally getting beaten to sleep.
Heavyweight is not a different game - its where you go when you want to fight older, lesser skilled, less athletic fighters. Thats why DC, the very same guy, can absolutely WALK THROUGH heavyweight, including summarily knocking out the champ. It has the oldest average age of any division. Are you familiar with any athletic sport in the world where having the oldest competitors is a good thing (read: its not)
I was responding to 'those heavyweights can beat up everyone else.' They demonstrably cannot, because guys like OSP and DC are literal, real world examples. We do not need to guess, its a fact.
I'm also throwing out my opinion that guys like Costa and Romero can beat 11-20 ranked heavyweights. Thats how bad heavyweight is.
If you can make 185 you don't fight at heavyweight 'just because' since you are going to take substantially more head trauma throughout a 20+ fight career, while fighting much larger humans. This is frankly common sense and I cannot believe I am typing it out for you.