Ronnie added size because weight is not equal to size.
How can someone come in bigger yet smoother without adding bodyweight?
That makes no sense. Or do you mean
weight as in his standard training poundages?
In that case, I largely agree
But unlike some, I'm a firm believer in the correlation between muscle size and strength, at least as is expressed for multiple reps (6 plus, and generally 10+). After Ronnie all but maxed out his strength, he came in bigger largely by sacrificing condition.