Well,
If you look at Yuri Van Gelder, he's verry muscular and verry strong
If you look at Eleftherios Petrounias, he's not extremely muscular like yuri van gelder, but also verry strong
So Strengt vs Weight is verry important.
Now my question is: How do you when you train gain allot of strenght but not the mass so you don't get havvier?