Agree on Gip to an extent. He had a couple of moves that he was very good at and had developed as a high school/AAU player. You could tell he was in a system where he was asked to post up and score, and he had to because he lacked height. He learned to use his size well to get position, and then score when he got the ball on the block. However, if you took those one or two things away, he really struggled to score and he also struggled to consistently draw contact when attacking the basket against bigger, quicker players. He didn't get into the body of defenders often enough and often got his shot blocked because of that.
I don't see Johnson coming in as skilled as Gip was at scoring on the block. And I'm hopeful Gip will develop a move or two to compliment what he does well so that he isn't as limited by catching the ball in places where he struggled to score.