To be fair to chopper, his timeskip power up was mainly him being the ability to control and uncontrollable body. Similar things to what other PoL users in Kuma and Sanji do.
Plus isn’t Choppers whole backstory about the link between emotions and the human body?
Plus isn’t Choppers whole backstory about the link between emotions and the human body?
It's also just very sudden to give him such a high level of a power up like this. Not that it hasn't happened before, but when it has happened, it's usually with people destined for great things (i.e Luffy and Zoro unlocking ACoA and/or ACoC, Koby unlocking ACoA, etc.)



