well I did a second character and it is possible to max out your stats you just got to complete all masters training and keep grinding with random fights before you fight ultimate shenron. all my rank for light character is S rank and I am happy ^____^
trying to max the stats for standard and heavy is difficult though
and it took me about a month to really max it completely all my stats
For one, you don't even need masters, they don't change the bonuses if you complete them you just have to be with him. 2: Ultimate Shenron has nothing to do with stats, with your logic, everybody would get S rank with their light hero --- The Best Time To Wear A Striped Sweater... Is All The Time!!!
It's not that either, It's what master you have on. Every master gives different EXP bonuses. All enemies you fight give a set amount which is equal for every stat,
E.g. Great Ape gives 40 for all stats. Have Vegito as a master and your 3 defenses will gain 80 but the other stats will gain the same amount --- The Best Time To Wear A Striped Sweater... Is All The Time!!!
When you click a master, it will ask if you want to train with them, you don't have to but you will have the bonus in EXP anyway the later characters give better stat bonuses. Experiment with every character until you find out what they give and what you want up. --- The Best Time To Wear A Striped Sweater... Is All The Time!!!