Each Player Has 4 Skills,
A skill that has an Orange number in it is affected by Base Power
A skill that has a Blue number in it is affected by Skill Power
A skill that has a Green number in it is affected by Character Level
Using Moana as an example, 3 of her 4 skills are blue in color, the 4th skill is not affected by anything other then character level
This means that 3 of her 4 skills are based off of skill power
Her disc that she gets from Merida, increases her Base Power.
Since none of her skills are Base Power skills, equipping and leveling the disc would have no influence on Increasing the power on any her skills. It would be a waste of resources, the way that I understand it, to increase the level of the disc. (I am not talking about star level of the disc)
There are other characters in the game where this also holds true for their friendship disc.
Is my way of thinking, wrong by any account?
Additionally, using Moana as the example, I would never equip a base skill mod to her. When you add a skill or base mod to a character, you are able to tell which of the 4 skills it affects by looking for a purple number in each of the 4 skills.
Hopefully, I explained this well enough, so that it is easy to understand