I also think they should change their mindset slightly the way Gohan kinda does and start to see the potential in everyone to become better and like how Gohan begins to train Videl to use her energy and how to combine it into her physicality they should train Hercule in the same way,
everything he did and accomplished he did without tapping into his energy at all the way most of the others do,
someone like Goku should see all that Hercule accomplished without the masters and knowledge of energy that Goku had when he began training and see that if he shared his knowledge with him that Hercule could train to become as great a fighter as anyone else and his knowledge of martial arts is different than all of them as Hercule trained under different masters and developed a style of martial arts articulated well enough to develop his own dojo or school of martial arts,
Hercule would be able to teach Goku in his style and might be able to do so more effectively by training with Goku with Goku limiting himself by preventing himself from drawing on his energy and limiting his physical power so that while training with Hercule he would have to focus on and beat him with his mastery of martial arts forms and styles alone,
this would make better the martial arts forms and styles both use and would then positively affect and increase the power of their techniques and styles both would utilize utilizing energy both separately with energy attacks and how they combine their energy with their physicality,
They would progress and make better the craft,
see the potential that everyone has and help them realize it and surpass it,
like we’re trying to do,
always a teacher,
always a student,