Sure, he is no good as he was in WCI against Aokiji. But why would he stay at the same level when Smoker, Coby, Crocodile, the SHP, Lucci, Kaku, Supernova and others have got stronger?
The one thing holding him back was Big Mom "I don't need the help of a lowly child of mine". He already has AdCoO. He has CoC. He also had some sort of AdCoA or semi advanced CoA with his Block Mochi. And he is awakened. In my view the sky is the limit for this guy.