Let´s talk about...
Slavemasters and the Guard Captain
This are jobs that train passively your slaves. You can have 3 slavemasters, each of them train up to 4 slaves and One Guard captain, that trains the servants appointed as guards. Well, I have taken some numbers and made a 10 days run. No treats influence in the slaves I have selected for the run and no head maid appointed, but may be my household will have some passive effects I´m not aware off. Let´s see if we can get interesting data
Slave Master Enya: Skill 36 (Not great), 4 slaves:
Increase corruption (Max 60) : +3+3+4+4. Starting point 23,13,38,14
Increase Sexual Skills: +12,+12,+12,12 (spreaded between the 3).Starting point, all below 70
Increase Phisical skills: Dex:4,4,4,4: Starting point 30,30,31,31
Increase Phisical skills: Str: 4,4,4,4: Starting point 30,30,30,30
Slave Master Aiko: Skill 80, 4 slaves
Increase Discipline: +8,0,0,0. Starting point 25,70,70,70
Increase Kindness: +8,+7,0,0 Starting point 31,72,80,80
Increase Phisical skills: Dex:7,1,0,0,: Starting point 32,54,54,70
Increase Phisical skills: Str: 0,0,0,0: Starting point 60,60,60,60
Slavemaster Jordan. Skill 89, 4 slaves
Increase Discipline: +10,10,10,0. Starting point 40,41,47, 70
Increase Physical Skill Dex. 7,7,7,+2:Starting point 32,32,32,57
Increase Pysical Skill Str. 0,0,0,0. starting point 60,60,60,60
Increase Willpower: +10,10,0,0. Starting point 47,60,80,106
Well, I believe that we can draw some conclusions. The skill of the Slave Master it´s the chance of increasing each skill by one point, per day, and there are some kind of hard cap that put a max the increase of the slave Stats. Seems that Aiko have a cap on 55 Dex and Jordan on 60 Dex. Why the difference? I have no clue at all. But the cap exist, and seem to be 55-60 in Dx, 60 in St, 70 in Disc and 80 on Will. It´s curious that the game tell you the cap in Corruption, but not in other stats.
Captain Ltn Einar Corso. Skill 75 (+20 for being pretty famous)
Ranged Skill: +4,2,1,0,0,0: Starting point 10,59,5,80,82,92
Melee SKlli: +4,4,2,0,0,0: Starting point 10,76,5,82,97,98
Discipline: +6,4,4,4,0,0,0. Starting point: 25,25,32,57,80,80
That´s surprising. I was expecting at this point more or less the same that with the Slave Masters. And yes, we have a cap tht seems to be 80 on melee and ranged combat and unknow (but above 60) for Discipline. But I have no clue of why the yield it´s so low, or why Farah, with his 5 in combat (and no traits) yields so poorly, or why Aisha gets +6 in discipline, with a starting point of 25, the same of Farah. May be he is overloaded with 6 guards and can only attend properly
4, the same number as a Slave Master????
Edit. Yes. If you put more that 4 guards under the guard captain you are overloading him. With 4 guards the Guard Captain works as an Slave Mmaster (with the difference that you can put non slaves under his wing).