The Proficiency Special Skill says:
Unlearned: +1/5 ranks
Minor: +1/3 ranks
Core: +1/rank
The NPB says that the proficiencies work the same as for non-combat skill but:
Combat Training 0: No bonus
Combat Training I: +1/5 ranks
Combat Training II: +1/4 ranks
Should Minor Prof and CTII share the same mod? (+1/3 as stated on the special skill)
Or is the difference used to give Minor Proficiencies a reason to be bought on combat skills?
No, doing that would have made NPB more powerful that I wanted it to be.
NPB for non-combat skill works based on whether the PC has the proficiency or not, and NPB for combat skills works based on both having (or not) the proficiency and what combat training the TP provides right?
I am sorry, but I do not understand this question.
Is the NPB based on the highest combat skill? And does it applies always regardless of what weapon/skill the character uses at the moment?
NPB is based on the highest Melee Combat skill, and it ONLY APPLIES to other Melee Combat skills (which Proficiency bonuses would not apply to since Blades skill is a different skill than the Bludgeoning skill.....)
Also, it says it can be applied to other combat skills if the PC does not have said skill, so If my PC does not have a skill, it uses the NPB, but if he acquires 1 point in that skill, the NPB is lost... Or should use the higher bonus at a moment?
Take the Blades skill and say you had 6 ranks in short blades as your ONLY Proficiency.....
The Proficiency bonuses would give you a +1 in Long and Heavy Blades if you did not have either of those. If you had a Minor Proficiency in Long Blades, that would give you a +5 in Short Blades, a +2 in Long Blades and a +1 in Heavy Blades.
This alone would provide you NO benefits for Bludgeoning weapons since you have no skill ranks in it.
Now, say your character is a Scout (Weapon Training I), that means in addition to the above, You would also get a +1 in Bludgeoning, in Martial Arts and in Two-Handed weapon skills. It also means that you gain a +1 to DT as well.
Now, as it says, if the character has 1 rank in Bludgeoning, the NPB bonus would not apply to it anymore. He would still receive it for the other two melee based combat skills. Now, if theis character ignored Blades skill and ended up with 7 ranks in Bludgeoning, you would then have the NPB based on it instead of blades from that point on.
Basically, the NPB acts as an extended Proficiency Bonus for melee based combat skills, but only if you have no ranks in them.
The idea behind the NPB is that as you learn to use weapons, you will eventually be able to use almost any weapon, to at least some minor degree even if you have no training in it. It also allows any melee training to assist in defense since you know the basics of how weapons move.