There are a few pros who really stood out as massive.
I met Lee Priest at the 1998 Arnold Classic and he was enormous. I will say this however, he had to climb up 3 (yes, three) steps and he was exhausted. He was filled with so much fluid he couldn't walk very far or fast but he was enormous at his height.
Paul Dillet guest posed at a show run by Maz Ali in New Jersey perhaps in the early 90's and he was the biggest bodybuilder I ever met. He appeared as if someone filled every bodypart with air. I thought he was a balloon at the Macy's Thanksgiving Day Parade he was so round. If ever a comic book character fell to earth, it was Paul Dillet. Not the nicest guy. Mattarazzo was one of the all time best guys to ever meet.
But there was one time, perhaps in South Carolina, where Dennis James competed and we saw him walking around and then hung out with him. He and Craig are quite friendly so I have spent time with Dennis. Well, either he or Branch I think won that show but walking around, in a tank top, he was truly a sight to see.
In person, those guys impressed me the most. Yes, Dorian was big but it was a guest posing and he was bloated big. Kevin was large too and Flex was Flex, but the first 3 guys I mentioned really made you stop and wonder, damn, how does that even work?
Craig has told me that backstage, the guy who most surprised him with just how big he was, and again, Craig has stood next to them all, was Milos. Craig said that Milos was just so much bigger than any photo or video he ever saw of him. Backstage in NY, Milos made most guys look small. I was surprised too.
Craig also told me that in person, as opposed to actually on stage next to other guys, one of the biggest and most impressive guys ever was Pavlo. Knowing he is one of my favorites, Craig called me over to show me backstage just how big was Pavlo and I too was really surprised. Craig and I don't have the same "favorite" bodybuilders so when he came out and said how big both Milos and Pavlo were, I knew it was real.