Pica had a strong annoying fruit. It's very hard to get him out and it's super matchup dependent who will get through him. Let's take someone like marco who is obviously stronger than Pica, despite him being stronger marco would likely have a hard time getting to him as a blunt force, speed and endurance type fighter. Same for jack and queen. Don't know if king has sword hax but from what we have seen the same applies. Pica was made to be cut up by zoro. As soon as you got too Pica he wasn't a threat. And if you could deal with the golem attacks he was no threat attack wise either. He has no feats, attack or durability wise, out of his golem. But sure, it was still impressive. He is such a poor character to base the strength of others off tho.