So like I love Whitebeard soo much (better character than Enel, IMO) but I still think that the Goro Goro no Mi is an OP fruit. Once you’re able to manipulate the electrical currents in your body, your nerves/brain will be able to develop so much more. If someone not super cocky and lazy had it, that fruit could lead to ridiculous power ups just by deciding to improve at strategy, languages, etc. Once the decision is made, he can focus on those areas (his brain can actually develop based on attention and training combined with the synapses) and they will get better. Basically his mantra was so great because of the fruit. So if he realized the need to improve or focus it elsewhere, then those abilities would be boosted. But I’m tired and rambling so I’ll stop now lol