Number one thing - in hero section in overview where you can see your hero masteries - it shows how much you get from hero levels, kingdoms and guild, but doesnt show how much he gets from his class (nor is it actually calculated towards the shown total).
Number two thing - Iam missing a screen for your hero health, armor, attack and magic with a similar breakdown. The only way to figure out how much stats your hero actually has is to go to troop builder and check the total stats, but you will have no clue how much is just from the hero himself, how much is from kingdoms, class etc… So i think it would be best is somewhere in the hero menu was a similar thing to the overview - just a total sum of stats with rotating captions on how much the hero gets from where.